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Windows path mtu discovery + Juniper MX не открываются vesti.ru !

Добрый день!

Имеется бордер Juniper MX80 с двумя Uplink.

 

Столкнулись с проблемой что некоторое время назад перестали открываться сайты, например, vesti.ru netbynet.ru.

Проблем со скоростью нет, не открываются именно эти ресурсы (иногда грузится только шапка сайта).

 

Помогает решить проблему:

1) выключение одного из аплинков, видимо у них где-то косяк.

2) понижение МТУ на клиенте до ~ 1400

 

Замечания:

1) проблема наблюдается только на WindowsXP/7

2) у "косячного" провайдера с этими сайтами проблем нет

3) пинги с флагом DF проходят (1472)

 

 

приложил дампы.

rghost.ru/60330690 - не работает

rghost.ru/60330700

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ради эксперимента попробуйте оотключить sack на клиенте.

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Не МТС случайно косячный аплинк?

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ради эксперимента попробуйте оотключить sack на клиенте.

к сожалению не нашел как это сделать на Windows

+ хотелось бы решить это как-то на магистрали

 

Не МТС случайно косячный аплинк?

нет

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+ хотелось бы решить это как-то на магистрали

 

 

как временный костыль (пока не разберётесь в чём проблема) можно делать тупо tcp adjust mss всем абонентам

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как временный костыль (пока не разберётесь в чём проблема) можно делать тупо tcp adjust mss всем абонентам

думали над этим. это кстати аппаратно делается?

 

больше думаем над тем как доказать провайдеру что у него проблема.

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думали над этим. это кстати аппаратно делается?

 

по mx80 надо даташит смотреть детально, но в любом случае это относится только к tcp-syn пакетам, которых в нормальных условиях много меньше, чем всего остального трафика

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думали над этим. это кстати аппаратно делается?
у J нет аналога ip tcp adjust-mss из циски. для локального трафика можно сделать set system internet-options tcp-mss и т.п., для транзитного нужен стейтфул фаервол, который в сервис-модуле. если у вас в мх80 есть сервис-модуль, то можно сделать примерно так:
service-set tcp-mss {

tcp-mss 1380;

stateful-firewall-rules Permit-all;

interface-service {

service-interface sp-8/1/0.1;

}

}

stateful-firewall {

rule Permit-all {

match-direction input-output;

term 1 {

then {

accept;

}

}

}

}

вы бы получше подиагностировали. может быть у вас на транспорте где проблема. этот аджаст-мсс в современном мире нигде не стучит кроме впнов.
Edited by pfexec

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вы бы получше подиагностировали. может быть у вас на транспорте где проблема.

а куда копать-то в такой простейшей схеме? :)

между ПК который втыкается напрямую в access-порт J /30, никаких свитчей.

далее MX 2 аплника втыкаются в отдельный порт.

 

 

может здесь получится что посмотреть, но меня смутило только

Packet Forwarding Engine Input IPv4 Header Checksum Error and Output MTU Error statistics:
   Input Checksum             :                    0
   Output MTU                 :                79936

 

 

 

show pfe statistics traffic
Packet Forwarding Engine traffic statistics:
   Input  packets:         337011365502                 5870 pps
   Output packets:         353110134565                 6107 pps
Packet Forwarding Engine local traffic statistics:
   Local packets input                 :            128885668
   Local packets output                :             45431927
   Software input control plane drops  :                    0
   Software input high drops           :                    0
   Software input medium drops         :                    0
   Software input low drops            :                    0
   Software output drops               :                    0
   Hardware input drops                :                    0
Packet Forwarding Engine local protocol statistics:
   HDLC keepalives            :                    0
   ATM OAM                    :                    0
   Frame Relay LMI            :                    0
   PPP LCP/NCP                :                    0
   OSPF hello                 :              4129395
   OSPF3 hello                :                    0
   RSVP hello                 :                    0
   LDP hello                  :                    7
   BFD                        :                   31
   IS-IS IIH                  :                    0
   LACP                       :                    0
   ARP                        :             69827214
   ETHER OAM                  :                    0
   Unknown                    :                   20
Packet Forwarding Engine hardware discard statistics:
   Timeout                    :                    0
   Truncated key              :                    0
   Bits to test               :                    0
   Data error                 :                    0
   Stack underflow            :                    0
   Stack overflow             :                    0
   Normal discard             :            219025584
   Extended discard           :                    0
   Invalid interface          :                    0
   Info cell drops            :                    0
   Fabric drops               :                    0
Packet Forwarding Engine Input IPv4 Header Checksum Error and Output MTU Error statistics:
   Input Checksum             :                    0
   Output MTU                 :                79936



show system statistics
Tcp:
        78998923 packets sent
                17312982 data packets (3728852153 bytes)
                123126 data packets retransmitted (51097457 bytes)
                0 resends initiated by MTU discovery
                60796048 ack only packets (23137971 packets delayed)
                0 URG only packets
                0 window probe packets
                357555 window update packets
                2576089 control packets
        309398295 packets received
                15916681 acks(for 3720454381 bytes)
                249400691 duplicate acks
                0 acks for unsent data
                41606277  packets received in-sequence(1267652725 bytes)
                29889427 completely duplicate packets(7870083 bytes)
                46 old duplicate packets
                6482 packets with some duplicate data(1844008 bytes duped)
                9267 out-of-order packets(1608851 bytes)
                10 packets of data after window(0 bytes)
                0 window probes
                800443 window update packets
                22388 packets received after close
                24204 discarded for bad checksums
                328 discarded for bad header offset fields
                0 discarded because packet too short
        97644 connection requests
        345899 connection accepts
        45332 bad connection attempts
        0 listen queue overflows
        345991 connections established (including accepts)
        443529 connections closed (including 63701 drops)
                161 connections updated cached RTT on close
                161 connections updated cached RTT variance on close
                71 connections updated cached ssthresh on close
        97448 embryonic connections dropped
        15692065 segments updated rtt(of 13948524 attempts)
        140879 retransmit timeouts
                591 connections dropped by retransmit timeout
        0 persist timeouts
                0 connections dropped by persist timeout
        190659113 keepalive timeouts
                190658676 keepalive probes sent
                437 connections dropped by keepalive
        1693062 correct ACK header predictions
        40184513 correct data packet header predictions
        376837 syncache entries added
                40081 retransmitted
                23998 dupsyn
                13 dropped
                345899 completed
                0 bucket overflow
                0 cache overflow
                23800 reset
                7138 stale
                0 aborted
                0 badack
                0 unreach
                0 zone failures
        0 cookies sent
        0 cookies received
        8989 SACK recovery episodes
        153 segment retransmits in SACK recovery episodes
        82615 byte retransmits in SACK recovery episodes
        16486 SACK options (SACK blocks) received
        3202 SACK options (SACK blocks) sent
        0 SACK scoreboard overflow
        0 ACKs sent in response to in-window but not exact RSTs
        0 ACKs sent in response to in-window SYNs on established connections
        0 rcv packets dropped by TCP due to bad address
        0 out-of-sequence segment drops due to insufficient memory
        2167200 RST packets
        10091 ICMP packets ignored by TCP
        0 send packets dropped by TCP due to auth errors
        0 rcv packets dropped by TCP due to auth errors
        0 outgoing segments dropped due to policing
udp:
        11660097 datagrams received
        0 with incomplete header
        0 with bad data length field
        104 with bad checksum
        5296837 dropped due to no socket
        2016748 broadcast/multicast datagrams dropped due to no socket
        71 dropped due to full socket buffers
        0 not for hashed pcb
        4346337 delivered
        6365140 datagrams output
ip:
        422863400 total packets received
        0 bad header checksums
        0 with size smaller than minimum
        0 with data size < data length
        0 with header length < data size
        0 with data length < header length
        0 with incorrect version number
        0 packets destined to dead next hop
        252804 fragments received
        0 fragments dropped (dup or out of space)
        0 fragments dropped (queue overflow)
        0 fragments dropped after timeout
        0 fragments dropped due to over limit
        126402 packets reassembled ok
        419594472 packets for this host
        922274 packets for unknown/unsupported protocol
        89 packets forwarded
        0 packets not forwardable
        0 redirects sent
        321729449 packets sent from this host
        181 packets sent with fabricated ip header
        0 output packets dropped due to no bufs
        570 output packets discarded due to no route
        1681 output datagrams fragmented
        3362 fragments created
        0 datagrams that can't be fragmented
        2 packets with bad options
        121271 packets with options handled without error
        0 strict source and record route options
        0 loose source and record route options
        0 record route options
        42 timestamp options
        0 timestamp and address options
        0 timestamp and prespecified address options
        0 option packets dropped due to rate limit
        121182 router alert options
        0 multicast packets dropped (no iflist)
        0 packets dropped (src and int don't match)
        0 transit re packets dropped on mgmt i/f
        0 packets used first nexthop in ecmp unilist
        91883462 incoming ttpoip packets received
        0 incoming ttpoip packets dropped
        35253992 outgoing TTPoIP packets sent
        0 outgoing TTPoIP packets dropped
        32 raw packets dropped. no space in socket recv buffer
        0 packets consumed by virtual-node processing
icmp:
        0 drops due to rate limit
        3280097 calls to icmp_error
        0 errors not generated because old message was icmp
        Output Histogram 
                1850960 echo reply
                3280071 destination unreachable
                2 parameter problem
                2413 time stamp reply
        0 messages with bad code fields
        0 messages less than the minimum length
        2452 messages with bad checksum
        0 messages with bad source address
        92 messages with bad length
        0 echo drops with broadcast or multicast destinaton address
        0 timestamp drops with broadcast or multicast destination address
        Input Histogram 
                4065 echo reply
                30535 destination unreachable
                11 source quench
                187 routing redirect
                1850960 echo
                6006 time exceeded
                1 parameter problem
                2413 time stamp
        1853373 message responses generated
igmp:
        922265 messages received
        0 messages received with too few bytes
        0 messages received with bad checksum
        922263 membership queries received
        0 membership queries received with invalid fields
        0 membership reports received
        0 membership reports received with invalid fields
        0 membership reports received for groups to which we belong
        1682919 Membership reports sent
ipsec:
        0 inbound packets processed successfully
        0 inbound packets violated process security policy
        0 inbound packets with no SA available
        0 invalid inbound packets
        0 inbound packets failed due to insufficient memory
        0 Inbound packets failed getting SPI
        0 inbound packets failed on AH replay check
        0 inbound packets failed on ESP replay check
        0 inbound packets considered authentic
        0 inbound packets failed on authentication
        0 inbound ESP packets considered authentic
        0 inbound ESP packets failed on authentication
        0 outbound packets processed successfully
        0 Outbound packets violated process security policy
        0 outbound packets with no SA available
        0 invalid outbound packets
        0 outbound packets failed due to insufficient memory
        0 outbound packets with no route
        0 SPD cache lookups
        0 SPD cache misses
raw_if:
        0 RAW packets transmitted
        0 PPPOE packets transmitted
        0 ISDN packets transmitted
        0 DIALER packets transmitted
        0 PPP packets transmitted to pppd
        0 PPP packets transmitted to jppd
        0 IGMPL2 packets transmitted
        0 MLDL2 packets transmitted
        0 Fibre Channel packets transmitted
        0 FIP packets transmitted
        0 STP packets transmitted
        0 LACP packets transmitted
        0 VCCP packets transmitted
        0 Fabric OAM packets transmitted
        0 VCCP packets transmitted
        0 output drops due to tx error
        0 MPU packets transmitted
        0 PPPOE packets received
        0 ISDN packets received
        0 DIALER packets received
        0 PPP packets received from pppd
        0 MPU packets received
        0 PPP packets received from jppd
        0 IGMPL2 packets received
        0 MLDL2 packets received
        0 Fibre Channel packets received
        0 FIP packets received
        14339368 STP packets received
        0 LACP packets received
        0 VCCP packets received
        0 Fabric OAM packets received
        0 VCCP packets received
        0 Fibre Channel packets dropped
        0 FIP packets dropped
        0 STP packets dropped
        0 LACP packets dropped
        0 Fabric OAM packets dropped
        0 VCCP packets dropped
        0 Input drops due to bogus protocol
        0 input drops due to no mbufs available
        0 input drops due to no space in socket
        0 input drops due to no socket
arp:
        47279309 datagrams received
        102432 ARP requests received
        319268 ARP replies received
        2014920 resolution request  received
        0 unrestricted proxy requests
        0 restricted proxy requests
        0 received proxy requests
        0 unrestricted proxy requests not proxied
        0 restricted proxy requests not proxied
        0 datagrams with bogus interface
        0 datagrams with incorrect length
        0 datagrams for non-IP protocol
        0 datagrams with unsupported op code
        0 datagrams with bad protocol address length
        0 datagrams with bad hardware address length
        0 datagrams with multicast source address
        49797 datagrams with multicast target address
        0 datagrams with my own hardware address
        45749596 datagrams for an address not on the interface
        0 datagrams with a broadcast source address
        1 datagrams with source address duplicate to mine
        1057458 datagrams which were not for me
        73449 packets discarded waiting for resolution
        48 packets sent after waiting for resolution
        10551168 ARP requests sent
        102432 ARP replies sent
        0 requests for memory denied
        0 requests dropped on entry
        0 requests dropped during retry
        0 requests dropped due to interface deletion
        0 requests on unnumbered interfaces
        0 new requests on unnumbered interfaces
        0 replies for from unnumbered interfaces
        0 requests on unnumbered interface with non-subnetted donor
        0 replies from unnumbered interface with non-subnetted donor
        0 arp packets rejected as family is configured with deny arp
        0 arp response packets are rejected on mace icl interface
        757 arp replies are rejected as source and destination is same
        0 arp probe for proxy address reachable from the incoming interface
        0 arp request discarded for vrrp source address
        0 self arp request packet received on irb interface
        0 proxy arp request discarded as source ip is a proxy target
        0 arp packets are dropped as nexthop allocation failed
        0 arp packets received from peer vrrp rotuer and discarded
        0 arp packets are rejected as target ip arp resolve is in progress
        0 grat arp packets are ignored as mac address is not changed
        0 arp packets are dropped from peer vrrp
        0 arp packets are dropped as driver call failed
        0 arp packets are dropped as source is not validated
ip6:
        0 total packets received
        0 packets with size smaller than minimum
        0 packets with data size < data length
        0 packets with bad options
        0 packets with incorrect version number
        0 fragments received
        0 fragments dropped (dup or out of space)
        0 fragments dropped after timeout
        0 fragments that exceeded limit
        0 packets reassembled ok
        0 packets for this host
        0 packets forwarded
        0 packets not forwardable
        0 redirects sent
        0 packets sent from this host
        0 packets sent with fabricated ip header
        0 output packets dropped due to no bufs, etc.
        0 output packets discarded due to no route
        0 output datagrams fragmented
        0 fragments created
        0 datagrams that can't be fragmented
        0 packets that violated scope rules
        0 multicast packets which we don't join
        0 packets whose headers are not continuous
        0 tunneling packets that can't find gif
        0 packets discarded due to too may headers
        0 failures of source address selection
        source addresses on an outgoing I/F
                2 link-locals
        source addresses of same scope
                2 link-locals
        0 forward cache hit
        0 forward cache miss
        0 Packets destined to dead next hop
        0 option packets dropped due to rate limit
        0 Packets dropped (src and int don't match)
        0 packets dropped due to bad protocol
        0 transit re packet(null) dropped on mgmt i/f
icmp6:
        0 Calls to icmp_error
        0 Errors not generated because old message was icmp error
        0 Errors not generated because rate limitation
        Output histogram: 
                6 neighbor solicitation
                2 neighbor advertisement
        0 Messages with bad code fields
        0 Messages < minimum length
        0 Bad checksums
        0 Messages with bad length
                0 No route
                0 Administratively prohibited
                0 Beyond scope
                0 Address unreachable
                0 Port unreachable
                0 packet too big
                0 Time exceed transit
                0 Time exceed reassembly
                0 Erroneous header field
                0 Unrecognized next header
                0 Unrecognized option
                0 redirect
                0 Unknown
        0 Message responses generated
        0 Messages with too many ND options
pfkey:
        24 Requests sent from userland
        1248 Bytes sent from userland
        histogram by message type: 
                12 reserved
                12 dump
        0 Messages with invalid length field
        0 Messages with invalid version field
        0 Messages with invalid message type field
        0 Messages too short
        0 Messages with memory allocation failure
        0 Messages with duplicate extension
        0 Messages with invalid extension type
        0 Messages with invalid sa type
        0 Messages with invalid address extension
        24 Requests sent to userland
        1248 Bytes sent to userland
        histogram by message type: 
                12 reserved
                12 dump
        22 Messages toward single socket
        0 Messages toward all sockets
        0 Messages toward registered sockets
        0 Messages with memory allocation failure
clnl:
        0 Total packets received
        0 Packets delivered
        0 Too small packets
        0 Packets with bad header length
        0 Packets with bad checksum
        0 Bad version packets
        0 Unknown or unsupported protocol packets
        0 Packets with bogus sdl size
        0 No free memory in socket buffer
        0 Send packets discarded
        0 Sbappend failure
        0 Mcopy failure
        0 Address fields were not reasonable
        0 Segment information forgotten
        0 Forwarded packets
        0 Total packets sent
        0 Output packets discarded
        0 Non-forwarded packets
        0 Packets fragmented
        0 Fragments sent
        0 Fragments discarded
        0 Fragments timed out
        0 Fragmentation prohibited
        0 Packets reconstructed
        0 Packets destined to dead nexthop
        0 Packets discarded due to no route
        0 Error pdu rate drops
        0 ER pdu generation failure
esis:
        0 Total pkts received
        0 Total packets consumed by protocol
        0 Pdus received with bad checksum
        0 Pdus received with bad version number
        0 Pdus received with bad type field
        0 Short pdus received
        0 Pdus withbogus sdl size
        0 Pdus with bad header length
        0 Pdus with unknown or unsupport protocol
        0 No free memory in socket buffer
        0 Send packets discarded
        0 Sbappend failure
        0 Mcopy failure
        0 ISO family not configured
tnp:
        39369 Unicast packets received
        14372737 Broadcast packets received
        0 Fragmented packets received
        0 Hello packets dropped
        0 Fragments dropped
        1 Fragment reassembly queue flushes
        0 Packets with tnp src address collision received
        14372736 Hello packets received
        0 Control packets received
        0 Rdp packets received
        39370 Udp packets received
        0 Tunnel packets received
        0 Input packets discarded with no protocol
        0 Packets of version unspecified received
        0 Packets of version 1 received
        0 Packets of version 2 received
        14412106 Packets of version 3 received
        39369 Unicast packets sent
        14358678 Broadcast packets sent
        0 Fragmented packets sent
        0 Hello packets dropped
        0 Fragments dropped
        14358678 Hello packets sent
        0 Control packets sent
        0 Rdp packets sent
        39369 Udp packets sent
        0 Tunnel packets sent
        0 Packets sent with unknown protocol
        0 Packets of version unspecified sent
        0 Packets of version 1 sent
        0 Packets of version 2 sent
        14398047 Packets of version 3 sent
rdp:
        0 Input packets
        0 Packets discarded for bad checksum
        0 Packets discarded due to bad sequence number
        0 Refused connections
        0 Acks received
        0 Packets dropped due to full socket buffers
        0 Retransmits
        0 Output packets
        0 Acks sent
        0 Connects
        0 Closes
        0 Keepalives received
        0 Keepalives sent
tudp:
        39370 Datagrams received
        0 Datagrams with incomplete header
        0 Datagrams with bad data length field
        0 Datagrams with bad checksum
        0 Datagrams dropped due to no socket
        0 Broadcast/multicast datagrams dropped due to no socket
        0 Datagrams dropped due to full socket buffers
        39370 Delivered
        39369 Datagrams output
ttp:
        35254368 Packets sent
        0 Packets sent while unconnected
        0 Packets sent while interface down
        0 Packets sent couldn't get buffer
        0 Packets sent couldn't find neighbor
        61618817 L2 packets received
        0 Unknown L3 packets received
        30264824 IPv4 L3 packets received
        0 MPLS L3 packets received
        0 MPLS->IPV4 L3 packets received
        0 IPv4->MPLS L3 packets received
        0 IPv6 L3 packets received
        0 ARP L3 packets received
        0 CLNP L3 packets received
        0 TNP L3 packets received
        0 NULL L3 packets received
        0 Cyclotron cycle L3 packets received
        0 Cyclotron send L3 packets received
        0 Packets received while unconnected
        0 Packets received from unknown ifl
        0 Input packets couldn't get buffer
        0 Input packets with bad type
        0 Input packets with discard type
        0 Input packets with too many tlvs
        0 Input packets with bad tlv header
        0 Input packets with bad tlv type
        0 Input packets dropped based on tlv result
        0 Input packets for which rt lookup is bypassed
mpls:
        0 Total MPLS packets received
        0 Packets forwarded
        0 Packets dropped
        0 Packets with header too small
        0 After tagging, packets can't fit link MTU
        0 Packets with IPv4 explicit NULL tag
        0 Packets with IPv4 explicit NULL cksum errors
        0 Packets with router alert tag
        0 LSP ping packets (ttl-expired/router alert)
        0 Packets with ttl expired
        0 Packets with tag encoding error
        0 Packets discarded due to no route
        0 Packets used first nexthop in ecmp unilist
ethoamlfm:
        0 total received packets
        0 input drops due to bad interface state
        0 received packets forwarded
        0 total transmitted packets
        0 sent packets
        0 output drops due to bad interface state
ethoamcfm:
        0 total received packets
        0 input drops due to bad interface state
        0 received packets forwarded
        0 total transmitted packets
        0 sent packets
        0 output drops due to bad interface state
        0 flood requests forwarded to PFE
        0 flood requests dropped
vpls:
0 total packets received
0 with size smaller than minimum
0 with incorrect version number
0 packets for this host

0 packets with no logical interface
0 packets with no family
0 packets with no route table
0 packets with no auxiliary table
0 packets with no corefacing entry
0 packets with no CE-facing entry

0 mac route learning requests
0 mac routes learnt
0 requests to learn an existing route
0 learning requests while learning disabled on interface
0 learning requests over capacity
0 mac routes moved
0 requests to move static route

0 mac route aging requests
0 mac routes aged
0 bogus address in aging requests
0 requests to age static route
0 requests to re-ageout aged route
0 requests involving multiple peer FEs
0 aging acks from PFE
0 aging non-acks from PFE
0 aging requests timed out waiting on FEs
0 aging requests over max-rate
0 errors finding peer FEs
0 unsupported platform
0 dropped due to no l3 route table
0 dropped due to no local ifl
0 packets punted
0 dropped due to no socket
bridge:
0 total packets received
0 with size smaller than minimum
0 with incorrect version number
0 packets for this host

0 packets with no logical interface
0 packets with no family
0 packets with no route table
0 packets with no auxiliary table
0 packets with no corefacing entry
0 packets with no CE-facing entry

0 mac route learning requests
0 mac routes learnt
0 requests to learn an existing route
0 learning requests while learning disabled on interface
0 learning requests over capacity
0 mac routes moved
0 requests to move static route

0 mac route aging requests
0 mac routes aged
0 bogus address in aging requests
0 requests to age static route
0 requests to re-ageout aged route
0 requests involving multiple peer FEs
0 aging acks from PFE
0 aging non-acks from PFE
0 aging requests timed out waiting on FEs
0 aging requests over max-rate
0 errors finding peer FEs
0 unsupported platform
0 dropped due to no l3 route table
0 dropped due to no local ifl
0 packets punted
0 dropped due to no socket

 

 

 

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у J нет аналога ip tcp adjust-mss из циски.

У J есть аналог, только делается это на сервисных картах до релиза чтоли 14.2 через одно место. Начиная с релиза 14.2 вроде как привели в божеский вид. Надо уточнить

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У J есть аналог, только делается это на сервисных картах до релиза чтоли 14.2 через одно место. Начиная с релиза 14.2 вроде как привели в божеский вид. Надо уточнить
я про сервис модуль и сказал. про 14.2, да, все так:
Configurable TCP MSS Value—Starting in Junos OS Release 14.2, you can configure the TCP MSS value on MX Series routers. To specify a TCP MSS value on MX Series routers, include the tcp-mss statement at the [edit interfaces interface-name unit logical-unit-number family family] hierarchy level.
но использовать на продакшне 14.2R1 надо быть очень отважным.

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проблема как выяснилась в аплинке вышестоящего провайдера. сделали анонс только на ретн - все зашуршало.

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Случайно не МТС аплинк вышестоящего провайдера? :)))

 

p.s. дада, я знаю, что повторяюсь

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Случайно не МТС аплинк вышестоящего провайдера? :)))

нет. но сейчас гляну аплинк аплинка :)

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