RESOLVED: Re: 8.1 Box does not react on ICMP "unreachable - need to frag"

Tue Jan 18 17:59:00 UTC 2011

On Jan 18, 2011, at 6:14 AM, Axel Rau wrote:
> Am 18.01.2011 um 14:40 schrieb Artyom Viklenko:
>> Make sure DB2 got ICMP need-frag message and it not blocked.
>> Also, check sysctl variable 'net.inet.tcp.path_mtu_discovery'.
> 
> Yes to both. So this is a bug in 8.1?

If DF is true and the packet exceeds the MTU, then it is dropped per RFC-791.  This can be used by pMTU discovery, if enabled.

Regards,
-- 
-Chuck