Messages in this thread | | | Subject | Re: 2.4.20 Broken Path MTU Discovery? | From | Andi Kleen <> | Date | 03 Feb 2003 01:29:51 +0100 |
| |
"Carlos Velasco" <carlosev@newipnet.com> writes: > > ¿May be the Linux box is giving up PMTU? ¿Why? it now knows MTU is 400. > I have others windows boxes in the network, they work fine with PMTU.
A MTU of 400 is illegal, IPv4 requires a minimum MTU of 576 bytes. Below it linux uses the minimum MTU and turns off path mtu discovery (= drops DF)
You can change that minimum mtu by changing the ip_rt_min_pmtu variable (no sysctl, you have to change it in /dev/kmem or recompile)
-Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |