[Dnsmasq-discuss] DHCP server not assigning IP to RTMU86

Nicolas Cavallari nicolas.cavallari at green-communications.fr
Sat Jun 4 16:54:18 UTC 2022


On 23/05/2022 20:34, Kamil via Dnsmasq-discuss wrote:
> Dear Nicolas,
> 
> I've tried isc-dhcp-server without "authoritative" and it still work fine
> 
> 
>     If anything else fails, use tcpdump/wireshark.
> 
> 
> 
> I've used tcpdump. I've attached full log in this message:
> https://www.mail-archive.com/dnsmasq-discuss@lists.thekelleys.org.uk/msg16249.html 
> <https://www.mail-archive.com/dnsmasq-discuss@lists.thekelleys.org.uk/msg16249.html>
> please have a look.

There isn't enough information to debug things.  tcpdump only report a 
DHCP message of size 300 without reporting its content, which are 
important to see what's happening.

Ideally we would need a pcap file.  Censoring information in a pcap file 
is not easy but still possible with a hex editor.  Otherwise you can use 
"tshark -r capture.pcap -V" to output a text representation of the pcap, 
censor the output and give us the result.

Also, focus on the DHCP exchange with the RTMU86 that does not work. We 
already know how a successful DHCP exchange look like.



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