[Dnsmasq-discuss] unwanted debug messages

Simon Kelley simon at thekelleys.org.uk
Sat Jan 20 23:30:34 GMT 2018


I just committed a patch which does this, and some other changes to make
this work better.


Cheers,

Simon.


On 29/12/17 21:56, e9hack wrote:
> Hi,
> 
> since some time, the log is flooded with messages like this:
> 
> Fri Dec 29 20:53:50 2017 daemon.warn dnsmasq[20961]: reducing DNS packet size for nameserver 217.237.151.142 to 1280
> (17, 1280)
> 
> I did change the name server and start dnsmasq with the option '-edns-packet-max=1280'. It doesn't relay help. I did
> check the related source code. I don't understand the source code, but it looks strange for me.
> 
> I did add an additional check and now I don't get this messages any more.
> 
> --- forward.c.save	2017-12-14 23:40:48.000000000 +0100
> +++ forward.c	2017-12-29 21:34:51.131218864 +0100
> @@ -853,8 +853,8 @@
>    /* We tried resending to this server with a smaller maximum size and got an answer.
>       Make that permanent. To avoid reduxing the packet size for an single dropped packet,
>       only do this when we get a truncated answer, or one larger than the safe size. */
> -  if (server && (forward->flags & FREC_TEST_PKTSZ) &&
> -      ((header->hb3 & HB3_TC) || n >= SAFE_PKTSZ))
> +  if ((server && (forward->flags & FREC_TEST_PKTSZ) &&
> +      ((header->hb3 & HB3_TC) || n >= SAFE_PKTSZ)) && server->edns_pktsz > SAFE_PKTSZ)
>      {
>        server->edns_pktsz = SAFE_PKTSZ;
>        prettyprint_addr(&server->addr, daemon->addrbuff);
> 
> Regards,
> Hartmut
> 
> _______________________________________________
> Dnsmasq-discuss mailing list
> Dnsmasq-discuss at lists.thekelleys.org.uk
> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
> 


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