9
7
Under windows there is a registry setting to enable "Blackhole Router Detection", enabling path MTU discovery to function when there are misconfigured routers / firewalls in the path blocking the ICMP fragmentation needed messages.
http://technet.microsoft.com/en-us/library/cc958871.aspx
Is there an equivalent feature that can be enabled on Linux?
I am running Ubuntu 9.10 Kernel 2.6.31-14-generic and would be very interested in any commands to enable / monitor this behaviour or any links to articles / howtos explaining how it is implemented.
https://mellowd.co.uk/ccie/?tag=rfc4821 has a nice explanation, and a nice way to debug what is going on using "ip route get" and "ip -6 route show cache". Also, despite the name, net.ipv4.tcp_mtu_probing will affect IPv6 as well. – mcr – 2016-01-09T23:21:46.080
1link for your source please? – quack quixote – 2009-11-23T04:32:29.527
2http://kerneltrap.org/mailarchive/linux-net/2008/5/22/1910924 – Tim Williscroft – 2009-11-23T22:27:04.980
2thanks! added that link into the answer and tweaked the formatting a bit, hope you don't mind. – quack quixote – 2009-11-24T20:15:02.503