DHCP client does not function with some DHCP servers

Bugs
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1

The DHCP client in the recent rolling version do not function when connected to a DOCSIS router/modem in bridge mode. It is Sagemcom F@st 3890V3 CHWU.

The earlier version of 202209130217 functions well so something has been changed later. I hope it is possible to change it back.

I am not allowed to post any attechments, unfortunately.

2

Hi @Hubertus, what about dump traffic on bridge?
sudo tcpdump -n -i br0 port 67 or port 68 -vv -e

3

I hope it is possible to ue this:

vyos@VyOSrouter-5:~$ monitor traffic interface eth1
tcpdump: verbose output suppressed, use -v[v]… for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), snapshot length 262144 bytes
16:17:48.092337 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:17:49.089390 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 3c:ec:ef:01:a8:29 (oui Unknown), length 300
16:17:50.140318 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:17:52.124286 STP 802.1d, Config, Flags [Topology change], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:17:54.108254 STP 802.1d, Config, Flags [Topology change], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:17:56.092225 STP 802.1d, Config, Flags [Topology change], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:17:58.140196 STP 802.1d, Config, Flags [Topology change], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:00.124176 STP 802.1d, Config, Flags [Topology change], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:02.108147 STP 802.1d, Config, Flags [Topology change], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:02.898312 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 3c:ec:ef:01:a8:29 (oui Unknown), length 300
16:18:04.092107 STP 802.1d, Config, Flags [Topology change], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:06.140086 STP 802.1d, Config, Flags [Topology change], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:08.124062 STP 802.1d, Config, Flags [Topology change], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:10.108034 STP 802.1d, Config, Flags [Topology change], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:12.092007 STP 802.1d, Config, Flags [Topology change], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:14.139980 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:16.076422 IP6 fe80::861e:a3ff:fe76:6342 > ip6-allnodes: HBH ICMP6, multicast listener query v2 [gaddr ::], length 28
16:18:16.123942 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:18.107915 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:20.091887 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:22.139868 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:23.819758 IP 172.31.250.3.bootps > 255.255.255.255.bootpc: BOOTP/DHCP, Reply, length 420
16:18:23.819897 IP 172.31.250.3.bootps > 255.255.255.255.bootpc: BOOTP/DHCP, Reply, length 420
16:18:23.825422 IP 172.31.250.2.bootps > 255.255.255.255.bootpc: BOOTP/DHCP, Reply, length 420
16:18:23.825505 IP 172.31.250.2.bootps > 255.255.255.255.bootpc: BOOTP/DHCP, Reply, length 420
16:18:24.123832 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:24.834386 IP 172.31.250.3.bootps > 255.255.255.255.bootpc: BOOTP/DHCP, Reply, length 420
16:18:24.834487 IP 172.31.250.3.bootps > 255.255.255.255.bootpc: BOOTP/DHCP, Reply, length 420
16:18:24.837495 IP 172.31.250.2.bootps > 255.255.255.255.bootpc: BOOTP/DHCP, Reply, length 420
16:18:24.837569 IP 172.31.250.2.bootps > 255.255.255.255.bootpc: BOOTP/DHCP, Reply, length 420
16:18:26.107814 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:28.091777 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:30.139763 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:32.123728 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:34.107699 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:36.091678 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:38.139637 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:40.123620 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:42.107578 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:44.091559 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:46.139534 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:48.123506 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:50.107479 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:52.091447 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:54.139421 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:56.123383 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:18:58.107366 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:19:00.091342 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:19:02.139300 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:19:04.123276 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:19:06.107257 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:19:08.091228 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35
16:19:10.139200 STP 802.1d, Config, Flags [none], bridge-id 8000.84:1e:a3:76:63:42.8003, length 35