Reproduced the problem and verified the fix. @timotunk, if you would like to give the fix a try, it's available in this PPA for jammy:
https://launchpad.net/~ahasenack/+archive/ubuntu/dnsmasq- relay-2042587/+packages I'll in the meantime prepare the SRU paperwork and merge proposal for review. ** Changed in: dnsmasq (Ubuntu Jammy) Status: Triaged => In Progress -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to dnsmasq in Ubuntu. https://bugs.launchpad.net/bugs/2042587 Title: jammy's version breaks existing dhcp scripts with relay Status in dnsmasq package in Ubuntu: New Status in dnsmasq source package in Jammy: In Progress Bug description: When upgrading from focal to jammy, existing dnsmasq dhcp-scripts stopped working in an environment where a DHCP relay is in use. Instead of the expected client IP address, the script gets the _relay_ IP address as an argument. From dnsmasq documentation for --dhcp- script: > The arguments to the process are "add", "old" or "del", the MAC address of the host (or DUID for IPv6) , the IP address, and the hostname, if known. I believe the change has been inadverently made in upstream commit 527c3c7d0d3bb4bf5fad699f10cf0d1a45a54692 (https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=blobdiff;f=src/helper.c;h=02340a01c00031db0cc682c8a4a279cfc1db574e;hp=d81de9622e6d484a264496b2cd3638b4e15e9677;hb=527c3c7d0d3bb4bf5fad699f10cf0d1a45a54692;hpb=fcb4dcaf7cc8a86ac2533b933161b6455f75bf8f) as the commit message only speaks about inet_ntoa replacement and not the behavioral change it also introduces (previously the relay address was only set to the environment variable, now it effectively overrides the prevoiusly set client's IP address). dnsmasq 2.86-1.1ubuntu0.3 / Ubuntu 22.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/2042587/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp