RADIUS/UDP and the DF bit

Stefan Winter stefan.winter at restena.lu
Wed Aug 19 08:17:53 CEST 2009


>> Then it compiles alright, but doesn't solve the problem:
>> 11:51:25.253733 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 221) radius-1.restena.lu.tdp-suite > eomund.restena.lu.radius: [udp sum ok] RADIUS, length: 193
>   Maybe the setsockopt() has to be done after the bind()...

You could always check bind's code: in their distribution tarball, it's
in lib/isc/unix/socket.c

There's a plethora of platform-specific #if directives that makes the
code really hard to read. But from what it looks like, binding happens
in a separate function and will be called separately after the socket is
opened with the PMTU sockopts. But you may want to verify that yourself :-)


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