I couldn't find an answer to this question in the archives, but I may be looking for the wrong keywords. If so, I apologize in advance and could someone please point me in the right direction? For an application I'm writing, it would be very useful to be able to distinguish between ICMP network unreachable (a temporary condition) and ICMP network administratively unreachable (effectively permanent). Similarly for host and port unreachable. Unfortunately, from /usr/src/linux-2.2.18/net/ipv4/icmp.c, it looks like the 2.2 kernel series seems to map both network unreachable and network adminstratively unreachable to ENETUNREACH. Is there any way from application space, when using a TCP session, to either get at the actual type and code fields from the ICMP unreachable packet or to find out if the trigger for an ENETUNREACH had the "fatal" flag set in the icmp_err_convert[] map? I'd like to avoid having to use something like a packet capture library, since that seems like overkill in this case. I thought SO_DEBUG might help, but I can't seem to find much info on whether it grabs ICMP errors and how to get at the data. Are there other options I'm missing here? thanks very much, Jeff Cours - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
