Alexey Karagodov wrote:
is there any progress?
just one "me too"
this problem appeared for me when i try to use vlan over lagg ( to em
NICs )
thanx
kernel: vlan301: discard oversize frame (ether type 800 flags 3 len
1514 > max 1510)
2007/7/13, Chuck Swiger <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>:
On Jul 12, 2007, at 1:38 PM, Stephen Clark wrote:
>> The MTU is actually defined in reference to a network segment such
>> as an "ethernet collision domain", and applies to all machines
>> sending traffic to that segment. If the MTU is really 1280,
>> nobody else should be sending larger packets, and the drivers
>> will drop any larger packets they receive and generate the
>> appropriate ICMP error....
>
> First thanks for responding but thats the problem,
> this did't generate an icmp when the packet was dropped.
>
> kernel: rl0: discard oversize frame (ether type 800 flags 3 len
> 1514 > max
> 1294)
>
> This message did not result in any icmp packet.
>
> I was running tcpdump looking for them.
Taking a quick look at ether_input() in src/sys/net/if_ethersubr.c
suggests that you are right-- if the incoming packet exceeds the MTU
being set, the input errors count for that interface is incremented,
but no ICMP_UNREACH_NEEDFRAG is generated even if DF flag is set.
You might file a PR and see whether you can get Andre or one of the
other networking gurus interested in fixing this. Or maybe I'll give
it a try myself if I can get some free time.... :-)
--
-Chuck
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No progress - still being discussed on freebsd-net mailing list as:
Re: 6.2 mtu now limits size of incomming packet
Steve
--
"They that give up essential liberty to obtain temporary safety,
deserve neither liberty nor safety." (Ben Franklin)
"The course of history shows that as a government grows, liberty
decreases." (Thomas Jefferson)
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