Interface stopped distributing DHCP leases

Knogle · February 24, 2022, 9:56pm

Hey friends, how are you doing.

Currently i'm experiencing a major issue on my setup.
I've got my OpenWrt device set up as a router on a stick with a 2x 1Gbps link working with LACP.
This setup has worked fine so far, but during the last 2 days i'm encountering major issues.
I've got a guest subinterface bonding-i0.320 on VLAN 320. The interface is also set up to distribute DHCP leases, but for some reason it clients didn't receive any DHCP lease anymore during the last 2 days.
The logs are filled and blown up by DHCP traffic.

Thu Feb 24 22:47:29 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Thu Feb 24 22:47:29 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Thu Feb 24 22:48:31 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:48:31 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:48:31 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:48:31 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:48:34 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Thu Feb 24 22:48:34 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Thu Feb 24 22:48:34 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:48:34 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:48:42 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:48:42 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:49:01 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:49:01 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:49:34 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:49:34 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:49:38 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Thu Feb 24 22:49:38 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Thu Feb 24 22:49:52 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0) 70:85:c2:3e:f2:bc
Thu Feb 24 22:49:52 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0) 192.168.3.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:49:52 2022 daemon.info dnsmasq-dhcp[13262]: DHCPREQUEST(bonding-i0) 192.168.3.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:49:52 2022 daemon.info dnsmasq-dhcp[13262]: DHCPACK(bonding-i0) 192.168.3.166 70:85:c2:3e:f2:bc debian
Thu Feb 24 22:49:58 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:49:58 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:50:05 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:50:05 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:50:13 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:50:13 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:50:24 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:50:24 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:50:32 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:50:32 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:50:39 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:50:39 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:50:43 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Thu Feb 24 22:50:43 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Thu Feb 24 22:50:58 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:50:58 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:03 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:03 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:12 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:12 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:23 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:23 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:33 2022 kern.info kernel: [2962491.621511] xt_CT: No such helper "sip"
Thu Feb 24 22:51:34 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:34 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:43 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:43 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:43 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:43 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:47 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Thu Feb 24 22:51:47 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Thu Feb 24 22:51:56 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:51:56 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:52:48 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Thu Feb 24 22:52:48 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Thu Feb 24 22:52:52 2022 daemon.info dnsmasq-dhcp[13262]: DHCPDISCOVER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Thu Feb 24 22:52:52 2022 daemon.info dnsmasq-dhcp[13262]: DHCPOFFER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e

In order to troubleshoot this issue i have created a Guest VLAN 320 subinterface on my system. It does receive an IPv6 lease, but not an IPv4 lease. Also the interface itself is reachable, so no issue in between the client and the router.
When using dhclient in order to obtain a lease, there is nothing received from the router's side, only discovers are being sent out.
I'm experiencing the same issue on all other devices on this VLAN. All the different interfaces on my OpenWrt device are working and distributing DHCP as expected.
What might be the issue here?

Thanks in advance!

tcpdump on bonding-i0.320 interface on the OpenWrt device.

16:06:53.187439 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from d8:47:32:f3:fb:68 (oui Unknown), length 300
16:06:54.188764 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:8b:46:c8 (oui Unknown), length 300
16:06:55.190121 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:24:a4:08 (oui Unknown), length 300
16:06:56.191258 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from d8:47:32:f3:fb:68 (oui Unknown), length 300
16:06:56.191775 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from b0:4e:26:2e:28:56 (oui Unknown), length 300
16:06:57.192374 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:8b:46:c8 (oui Unknown), length 300
16:06:58.193831 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:24:a4:08 (oui Unknown), length 300
16:06:59.195361 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from d8:47:32:f3:fb:68 (oui Unknown), length 300
16:06:59.195362 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from b0:4e:26:2e:28:56 (oui Unknown), length 300
16:07:00.196441 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:8b:46:c8 (oui Unknown), length 300
16:07:00.813742 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [S.], seq 4146907035, ack 1710942936, win 65160, options [mss 1460,sackOK,TS val 3824735217 ecr 2734714794,nop,wscale 7], length 0
16:07:00.816317 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [.], ack 33, win 509, options [nop,nop,TS val 3824735220 ecr 2734714797], length 0
16:07:00.836978 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 1:33, ack 33, win 509, options [nop,nop,TS val 3824735241 ecr 2734714797], length 32
16:07:00.838474 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [.], ack 1545, win 501, options [nop,nop,TS val 3824735243 ecr 2734714819], length 0
16:07:00.840797 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 33:1089, ack 1545, win 501, options [nop,nop,TS val 3824735245 ecr 2734714819], length 1056
16:07:00.844170 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [.], ack 1593, win 501, options [nop,nop,TS val 3824735248 ecr 2734714825], length 0
16:07:00.857156 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 1089:1645, ack 1593, win 501, options [nop,nop,TS val 3824735261 ecr 2734714825], length 556
16:07:00.861156 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [.], ack 1609, win 501, options [nop,nop,TS val 3824735265 ecr 2734714842], length 0
16:07:00.862877 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [.], ack 1653, win 501, options [nop,nop,TS val 3824735267 ecr 2734714844], length 0
16:07:00.862877 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 1645:1689, ack 1653, win 501, options [nop,nop,TS val 3824735267 ecr 2734714844], length 44
16:07:00.870649 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 1689:1741, ack 1713, win 501, options [nop,nop,TS val 3824735275 ecr 2734714845], length 52
16:07:00.885006 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 1741:1793, ack 1949, win 501, options [nop,nop,TS val 3824735289 ecr 2734714853], length 52
16:07:00.893011 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 1793:1845, ack 2577, win 501, options [nop,nop,TS val 3824735297 ecr 2734714867], length 52
16:07:00.896274 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 1845:2945, ack 3717, win 501, options [nop,nop,TS val 3824735300 ecr 2734714875], length 1100
16:07:00.924922 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [.], ack 5905, win 501, options [nop,nop,TS val 3824735329 ecr 2734714905], length 0
16:07:00.932273 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 2945:2973, ack 5905, win 501, options [nop,nop,TS val 3824735336 ecr 2734714905], length 28
16:07:00.975754 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [.], ack 6017, win 501, options [nop,nop,TS val 3824735379 ecr 2734714914], length 0
16:07:01.137448 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 2973:3741, ack 6017, win 501, options [nop,nop,TS val 3824735541 ecr 2734714914], length 768
16:07:01.180566 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 3741:3925, ack 6017, win 501, options [nop,nop,TS val 3824735585 ecr 2734715162], length 184
16:07:01.181601 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [.], ack 6477, win 501, options [nop,nop,TS val 3824735586 ecr 2734715163], length 0
16:07:01.183250 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 3925:4033, ack 6477, win 501, options [nop,nop,TS val 3824735587 ecr 2734715163], length 108
16:07:01.184825 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4033:4493, ack 6477, win 501, options [nop,nop,TS val 3824735589 ecr 2734715165], length 460
16:07:01.197899 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:24:a4:08 (oui Unknown), length 300
16:07:01.213080 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4493:4553, ack 6477, win 501, options [nop,nop,TS val 3824735617 ecr 2734715167], length 60
16:07:02.198910 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from b0:4e:26:2e:28:56 (oui Unknown), length 300
16:07:02.198910 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from d8:47:32:f3:fb:68 (oui Unknown), length 300
16:07:03.200349 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:8b:46:c8 (oui Unknown), length 300
16:07:03.290633 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [.], ack 6513, win 501, options [nop,nop,TS val 3824737694 ecr 2734717271], length 0
16:07:03.291177 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4553:4589, ack 6513, win 501, options [nop,nop,TS val 3824737695 ecr 2734717271], length 36
16:07:03.506708 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [.], ack 6549, win 501, options [nop,nop,TS val 3824737910 ecr 2734717487], length 0
16:07:03.507798 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4589:4625, ack 6549, win 501, options [nop,nop,TS val 3824737912 ecr 2734717487], length 36
16:07:03.706126 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [.], ack 6585, win 501, options [nop,nop,TS val 3824738110 ecr 2734717687], length 0
16:07:03.707681 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4625:4661, ack 6585, win 501, options [nop,nop,TS val 3824738111 ecr 2734717687], length 36
16:07:03.779052 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4661:4697, ack 6621, win 501, options [nop,nop,TS val 3824738183 ecr 2734717759], length 36
16:07:03.946980 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4697:4733, ack 6657, win 501, options [nop,nop,TS val 3824738351 ecr 2734717927], length 36
16:07:04.202273 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:24:a4:08 (oui Unknown), length 300
16:07:05.043227 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4733:4769, ack 6693, win 501, options [nop,nop,TS val 3824739447 ecr 2734719023], length 36
16:07:05.202458 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from b0:4e:26:2e:28:56 (oui Unknown), length 300
16:07:05.203027 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from d8:47:32:f3:fb:68 (oui Unknown), length 300
16:07:05.228063 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4769:4805, ack 6729, win 501, options [nop,nop,TS val 3824739632 ecr 2734719207], length 36
16:07:05.348007 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4805:4841, ack 6765, win 501, options [nop,nop,TS val 3824739752 ecr 2734719327], length 36
16:07:05.539205 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4841:4877, ack 6801, win 501, options [nop,nop,TS val 3824739943 ecr 2734719519], length 36
16:07:05.659211 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4877:4913, ack 6837, win 501, options [nop,nop,TS val 3824740063 ecr 2734719639], length 36
16:07:05.788016 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4913:4949, ack 6873, win 501, options [nop,nop,TS val 3824740192 ecr 2734719767], length 36
16:07:05.971878 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4949:4985, ack 6909, win 501, options [nop,nop,TS val 3824740376 ecr 2734719951], length 36
16:07:06.204805 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:8b:46:c8 (oui Unknown), length 300
16:07:06.236141 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 4985:5021, ack 6945, win 501, options [nop,nop,TS val 3824740640 ecr 2734720215], length 36
16:07:06.348146 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 5021:5057, ack 6981, win 501, options [nop,nop,TS val 3824740752 ecr 2734720327], length 36
16:07:06.443378 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 5057:5093, ack 7017, win 501, options [nop,nop,TS val 3824740847 ecr 2734720423], length 36
16:07:06.563653 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 5093:5129, ack 7053, win 501, options [nop,nop,TS val 3824740967 ecr 2734720543], length 36
16:07:06.674633 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 5129:5165, ack 7089, win 501, options [nop,nop,TS val 3824741079 ecr 2734720655], length 36
16:07:06.826726 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 5165:5217, ack 7125, win 501, options [nop,nop,TS val 3824741231 ecr 2734720807], length 52
16:07:06.829481 IP 192.168.200.51.22 > OpenWrt.lan.44710: Flags [P.], seq 5217:5309, ack 7125, win 501, options [nop,nop,TS val 3824741234 ecr 2734720809], length 92
16:07:06.830030 IP 172.20.192.51 > OpenWrt.lan: ICMP echo request, id 30590, seq 1, length 64
16:07:07.206201 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:24:a4:08 (oui Unknown), length 300
16:07:07.855827 IP 172.20.192.51 > OpenWrt.lan: ICMP echo request, id 30590, seq 2, length 64
16:07:08.206904 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from b0:4e:26:2e:28:56 (oui Unknown), length 300
16:07:08.207381 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from d8:47:32:f3:fb:68 (oui Unknown), length 300
16:07:08.879871 IP 172.20.192.51 > OpenWrt.lan: ICMP echo request, id 30590, seq 3, length 64
16:07:09.208762 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:8b:46:c8 (oui Unknown), length 300
16:07:09.903347 IP 172.20.192.51 > OpenWrt.lan: ICMP echo request, id 30590, seq 4, length 64
16:07:10.210276 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:24:a4:08 (oui Unknown), length 300
16:07:10.927718 IP 172.20.192.51 > OpenWrt.lan: ICMP echo request, id 30590, seq 5, length 64
16:07:11.210880 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from b0:4e:26:2e:28:56 (oui Unknown), length 300
16:07:11.211390 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from d8:47:32:f3:fb:68 (oui Unknown), length 300
16:07:11.951513 IP 172.20.192.51 > OpenWrt.lan: ICMP echo request, id 30590, seq 6, length 64
16:07:12.212560 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:8b:46:c8 (oui Unknown), length 300
16:07:12.975439 IP 172.20.192.51 > OpenWrt.lan: ICMP echo request, id 30590, seq 7, length 64
16:07:13.214271 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:24:a4:08 (oui Unknown), length 300
16:07:13.999881 IP 172.20.192.51 > OpenWrt.lan: ICMP echo request, id 30590, seq 8, length 64
16:07:14.214838 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from b0:4e:26:2e:28:56 (oui Unknown), length 300
16:07:14.214838 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from d8:47:32:f3:fb:68 (oui Unknown), length 300
16:07:15.023518 IP 172.20.192.51 > OpenWrt.lan: ICMP echo request, id 30590, seq 9, length 64
16:07:15.216729 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:8b:46:c8 (oui Unknown), length 300
16:07:16.047480 IP 172.20.192.51 > OpenWrt.lan: ICMP echo request, id 30590, seq 10, length 64
16:07:16.218025 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 50:c7:bf:24:a4:08 (oui Unknown), length 300
16:07:17.071800 IP 172.20.192.51 > OpenWrt.lan: ICMP echo request, id 30590, seq 11, length 64

eduperez · February 25, 2022, 6:42pm

Perhaps your firewall is blocking the responses?

Knogle · February 25, 2022, 6:45pm

How can i check that?
I've moved my interface to LAN zone instead, and it's showing the same behaviour.
So IPv6 traffic works, and IPv4 not at all, even no DHCP.

Knogle · February 26, 2022, 5:15pm

I've gathered some additional interesting information.
As bonding-i0.320 is a 802.1Q subinterface, traffic goes in as intended with 802.1Q tag.
But DHCP offers on this interface, or for this subent, go out as untagged traffic, so they never reach their destination. What might be causing this?
Same for all return traffic, e.g. when pinging the bonding-i0.320 interface, return traffic tries to go out as untagged traffic.

EDIT: I am sorry for the inconvenience.
I was able to troubleshoot the issue. I had a misconfigured VPN tunnel. So the route for the local subnet was pointing to the tunnel interface, instead of the local connected bonding-i0.320 interface.

root@OpenWrt:/tmp# ip -4 route | grep 172.20.192
172.20.192.0/19 via 192.168.8.2 dev tun1

Sat Feb 26 18:32:29 2022 daemon.info dnsmasq-dhcp[7644]: DHCPDISCOVER(bonding-i0.320) 172.20.192.26 50:c7:bf:8b:46:c8
Sat Feb 26 18:32:29 2022 daemon.info dnsmasq-dhcp[7644]: DHCPOFFER(bonding-i0.320) 172.20.192.26 50:c7:bf:8b:46:c8
Sat Feb 26 18:32:29 2022 daemon.info dnsmasq-dhcp[7644]: DHCPREQUEST(bonding-i0.320) 172.20.192.26 50:c7:bf:8b:46:c8
Sat Feb 26 18:32:29 2022 daemon.info dnsmasq-dhcp[7644]: DHCPACK(bonding-i0.320) 172.20.192.26 50:c7:bf:8b:46:c8 EAP245-EG
Sat Feb 26 18:32:36 2022 daemon.info dnsmasq-dhcp[7644]: DHCPDISCOVER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Sat Feb 26 18:32:36 2022 daemon.info dnsmasq-dhcp[7644]: DHCPOFFER(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Sat Feb 26 18:32:36 2022 daemon.info dnsmasq-dhcp[7644]: DHCPREQUEST(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e
Sat Feb 26 18:32:36 2022 daemon.info dnsmasq-dhcp[7644]: DHCPACK(bonding-i0.320) 172.20.192.116 06:d0:fe:cd:70:7e millenium-fbe48
Sat Feb 26 18:32:53 2022 daemon.info dnsmasq-dhcp[7644]: DHCPDISCOVER(bonding-i0.320) 70:85:c2:3e:f2:bc
Sat Feb 26 18:32:53 2022 daemon.info dnsmasq-dhcp[7644]: DHCPOFFER(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Sat Feb 26 18:32:53 2022 daemon.info dnsmasq-dhcp[7644]: DHCPREQUEST(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc
Sat Feb 26 18:32:53 2022 daemon.info dnsmasq-dhcp[7644]: DHCPACK(bonding-i0.320) 172.20.192.166 70:85:c2:3e:f2:bc debian

system · March 8, 2022, 5:15pm

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