How to get cached PMTU information?

Hi,
is there a way to get cached information relating to "Path MTU Discovery"?

using the "ip" command
using a kernel module like tcp_probe
using a secret getsockopt()
or something else...

Regards,
Christophe

Hello,

Christophe Lohr a écrit :
> is there a way to get cached information relating to "Path MTU Discovery"?
>
> using the "ip" command

Maybe "ip route show cache" and "ip route get <address>".

Pascal Hambourg a écrit :
> Hello,
>
> Christophe Lohr a écrit :
>> is there a way to get cached information relating to "Path MTU Discovery"?
>>
>> using the "ip" command
>
> Maybe "ip route show cache" and "ip route get <address>".

Thank you

Are "ICMP host redirect" also there?

Christophe Lohr a écrit :
>>
>>> is there a way to get cached information relating to "Path MTU Discovery"?
>>>
>>> using the "ip" command
>>
>> Maybe "ip route show cache" and "ip route get <address>".
>
> Thank you
>
> Are "ICMP host redirect" also there?

Yes, routes created through an ICMP redirect are marked with the tag
<redirected>.