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
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