Hi,
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 :-) Stefan -- Stefan WINTER Ingenieur de Recherche Fondation RESTENA - Réseau Téléinformatique de l'Education Nationale et de la Recherche 6, rue Richard Coudenhove-Kalergi L-1359 Luxembourg Tel: +352 424409 1 Fax: +352 422473