[Dnsmasq-discuss] No DHCPOffer back but DHCPDiscover is being received by UML machine

[Simon Kelley]

On 16/04/2020 15:40, Josh H wrote:
> 
>     First, answer a simple question the answer to which I may have missed.
>     Is dnsmasq logging the receipt of DHCPDISCOVER messages? Can we see the
>     whole log showing that?
> 
> 
> Based on the config I provided at the initial message, I have the log
> file writing to /var/log/dnsmasq.log. This is the whole content of that
> file:
> 
> root at dns:~# cat /var/log/dnsmasq.log
> Apr 16 15:36:50 dnsmasq[1695]: started, version 2.80 DNS disabled
> Apr 16 15:36:50 dnsmasq[1695]: compile time options: IPv6 GNU-getopt
> DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth DNSSEC
> loop-detect inotify dumpfile
> Apr 16 15:36:50 dnsmasq-dhcp[1695]: DHCP, IP range 192.168.1.3 --
> 192.168.1.8, lease time 12h
> 
> No mention of the DHCPDiscover being acknowledged.
> 
>     The next stage is to run dnsmasq under strace (check back here if you
>     need instructions on that) and see what system calls it's making.
> 
> 
> What command would I need to run for this? And what service is best to
> upload the strace result, pastebin?


sudo strace -o /tmp/logfile /usr/bin/dnsmasq -d


Probably best to email the result to me direct.



Cheers,

Simon.

> 
> Thanks,
> Josh 
> 
> On Thu, 16 Apr 2020 at 12:49, Simon Kelley <simon at thekelleys.org.uk
> <mailto:simon at thekelleys.org.uk>> wrote:
> 
> 
> 
>     On 15/04/2020 19:27, Josh H wrote:
> 
>     > It's difficult for me to share the config outright as I'm using a
>     > modified version of netkit that I've updated to a much newer kernel
>     > - http://netkit-ng.github.io/. The netkit version that is available on
>     > that link is the one that worked with dnsmasq just fine, and that
>     > version was 2.62 and kernel 3.2. However I've updated it and am
>     running
>     > 2.80 and kernel 5.6. 
>     >
>     > Anything else I can provide you with that might help? It's a very
>     unique
>     > setup so I appreciate  it's probably not the easiest thing to try and
>     > debug. 
>     >
> 
>     First, answer a simple question the answer to which I may have missed.
>     Is dnsmasq logging the receipt of DHCPDISCOVER messages? Can we see the
>     whole log showing that?
> 
>     The next stage is to run dnsmasq under strace (check back here if you
>     need instructions on that) and see what system calls it's making.
> 
> 
>     Simon.
> 
> 
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