ok, I observed if i increase the UDP client packet size > local
interface MTU 1500, the client will fragment the packet first and
then send it out, if the UDP client packet size < local interface MTU
1500, the DF bit will be set when ip_no_pmtu_disc set to 0, is this
expected behavior ?
On
; On Fri, Oct 23, 2015, at 18:45, Vincent Li wrote:
>> It looks ip_no_pmtu_disc setting does not affect UDP IP packet DF bit
>> setting, is that intended behavior? echo 0, 1, 2, 3 respectively to
>> ip_no_pmtu_disc, UDP IP packet always have DF bit cleared, unless use
>>
I test again and i did see DF bit now, it is weird. I am going to do
more test, sorry for the noise.
On Mon, Oct 26, 2015 at 3:12 PM, Hannes Frederic Sowa
wrote:
> Hello,
>
> On Mon, Oct 26, 2015, at 23:00, Vincent Li wrote:
>> the UDP packet size is about 768, here
On Mon, Oct 26, 2015, at 23:53, Vincent Li wrote:
> ok, I observed if i increase the UDP client packet size > local
> interface MTU 1500, the client will fragment the packet first and
> then send it out, if the UDP client packet size < local interface MTU
> 1500, the DF bit will be set when
Hello,
On Mon, Oct 26, 2015, at 23:00, Vincent Li wrote:
> the UDP packet size is about 768, here is how packet path like:
>
> client
> server
> (eth0 mtu 1500 ip 10.3.72.69) (eth0 mtu 1500 ip
;
> It looks ip_no_pmtu_disc setting does not affect UDP IP packet DF bit
> setting, is that intended behavior? echo 0, 1, 2, 3 respectively to
> ip_no_pmtu_disc, UDP IP packet always have DF bit cleared, unless use
> IP_PMTUDISC_DO on IP_MTU_DISCOVER as ip man page says.
>
>
Hi,
It looks ip_no_pmtu_disc setting does not affect UDP IP packet DF bit
setting, is that intended behavior? echo 0, 1, 2, 3 respectively to
ip_no_pmtu_disc, UDP IP packet always have DF bit cleared, unless use
IP_PMTUDISC_DO on IP_MTU_DISCOVER as ip man page says.
in inet_create, seems
Hello,
On Fri, Oct 23, 2015, at 18:45, Vincent Li wrote:
> It looks ip_no_pmtu_disc setting does not affect UDP IP packet DF bit
> setting, is that intended behavior? echo 0, 1, 2, 3 respectively to
> ip_no_pmtu_disc, UDP IP packet always have DF bit cleared, unless use
> IP
From: Vincent Li
Date: Fri, 23 Oct 2015 10:01:50 -0700
> I think the no_pmtu_disc could be renamed to pmtu_disc to be less
> confusion to users.
We cannot rename sysctl values exported to the user without breaking
things.
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