[Dnsmasq-discuss] disable PMTU discovery

Simon Kelley simon at thekelleys.org.uk
Tue Jan 15 19:55:28 GMT 2008

Bodo Bellut wrote:
> Hi,
> [snip]
>>>For another PXE client I have to disable PMTU discovery on the machine 
>>>running dnsmasq (known Intel LANDesk problem). Do you think there's a 
>>>solution to this without globally disabling PMTU discovery?
>>A new area for me:
>>seems to indicate that it's possible to do it for a subnet (and maybe an 
>>individual host) using the routing table. Is that the sort of thing you 
> This would be an option. I just found another solution in the Squid 
> sources to disable PMTU discovery on a connection basis:
>    int i = IP_PMTUDISC_DONT;
>    setsockopt(conn->fd, SOL_IP, IP_MTU_DISCOVER, &i, sizeof i);
> If you could put this in, too, I'd be more than happy.
> cu, Bodo

Ok, test29 in the usual place. This sets the option for DHCP and TFTP 
sockets. Bodo, could you check that it works OK with your broken Intel 



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