@Evgeny Mirhasanov Ну да, как и должно быть.
Вот обмен со стороны клиента
root@shumbor:/var/log# tcpdump -nieth2
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on eth2, link-type EN10MB (Ethernet), snapshot length 262144 bytes
13:59:36.717769 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from a8:f9:4b:09:3b:4f, length 429
13:59:39.728104 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from a8:f9:4b:09:3b:4f, length 429
13:59:42.737573 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from a8:f9:4b:09:3b:4f, length 429
вот сервер
root@shumbor:/var/log# tcpdump -nieth1 port 67 or 68
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), snapshot length 262144 bytes
13:59:36.720208 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from a8:f9:4b:09:3b:4f, length 449
13:59:36.720501 IP 192.168.1.253.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 309
13:59:39.730523 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from a8:f9:4b:09:3b:4f, length 449
13:59:39.730877 IP 192.168.1.253.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 309
13:59:42.739974 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from a8:f9:4b:09:3b:4f, length 449
13:59:42.740386 IP 192.168.1.253.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 309
вот настройка железки касаемо dhcp. 1 - ложный dhcp сервер, 3 клиент, 7 - нормальный dhcp
ip dhcp snooping enable
ip dhcp snooping binding enable
!
ip dhcp snooping information enable
ip dhcp snooping information option subscriber-id format hex
!
Interface Ethernet1/0/1
switchport access vlan 3
!
Interface Ethernet1/0/3
switchport access vlan 3
!
Interface Ethernet1/0/7
switchport access vlan 3
ip dhcp snooping trust
!