Hello,
first I'd like to emphasize my "kudos" to all dnsmasq contributors!
There are so many nifty, well implemented and useful features in
dnsmasq, I like it very much (reading /etc/ethers e.g.). Same applies
to the mailinglist / local git decision!
But I'm facing a probably FreeBSD(#HAVE_BSD_NETWORK) isolated problem.
It occurs in dhcp relay mode - unfortunately I don't have any dtraces
or the like yet, just a description of the problem.
With this *dnsmasq.conf* (skipped server= DNS parameters) clients can
successfully acquires a DHCP lease:
no-resolv
no-hosts
domain=ab.cd.example.com
dhcp-range=172.17.147.0,172.17.147.254,255.255.240.0,15m
dhcp-authoritative
log-dhcp
startuplog dnsmasq[13148]: started, version 2.78 cachesize 150
startuplog dnsmasq[13148]: compile time options: IPv6 GNU-getopt
no-DBus no-i18n IDN2 DHCP DHCPv6 no-Lua TFTP no-conntrack no-ipset auth
no-DNSSEC loop-detect no-inotify
startuplog dnsmasq-dhcp[13148]: DHCP, IP range 172.17.147.0 --
172.17.147.254, lease time 15m
As soon as I add/uncomment *my actual config, no client is able to
acquire a lease*.
dhcp-relay=172.17.146.10,172.17.128.253
dhcp-proxy=172.17.146.10
startuplog dnsmasq-dhcp[13148]: DHCP relay from 172.17.146.10 to
172.17.128.253
On the interface with the <local address> (172.17.146.10), I can only
see this initial broadcast frame:
09:45:08.646733 ee:8c:ea:aa:1b:31 > ff:ff:ff:ff:ff:ff, ethertype IPv4
(0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP,
Request from ee:8c:ea:aa:1b:31, length 300
Absolutely no DHCP-related frames are traveling on the <server>
(172.17.128.253) interface (ngeth14).
This doesn't change if I alter the dhcp-relay line to
"dhcp-relay=172.17.146.10,ngeth14".
The log shows
runninglog dnsmasq-dhcp[13148]: DHCP relay 172.17.146.10 -> 172.17.128.253
but no frames materialize.
DNS-forwarder packets are captured on ngeth14 and the DNS forwarders,
which travel the same route, do work.
_To rule out application unrelated config errors I tried
https://github.com/sem-hub/dhcprelya/ - which works besides the missing
proxy support_.
The probably crucial detail:
I'm on FreeBSD (14.2, inside vnet(9) jail(8) but the dhcprelya test
should rule out all environmental details but #HAVE_BSD_NETWORK).
Any hints where how to start debugging highly appreciated.
My C and gdb skills are lousy and it got even worse since we're on llvm
(for a decade), but this one shouldn't be too hard to track down, if you
don';t leave me alone ;-)
Thanks in advance,
-harold
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