Arie,
On Fri, 6 Jul 2001, Arie Vayner wrote:
> Hi Guys,
>
> As the one in charge of the technical ADSL issues in Netvision, I can answer
> all the questions below...
>
> We have encountered a problem with our RedBack machine, which was not
> fragmenting packets with the DF bit set (as normal routers should do). It
> WAS sending the ICMP unreachable message, but walla are filtering ICMP, so
> the web servers never got the ICMP message, and could not make the MTU
> smaller.
Sounds reasonable. Typical sysadmins think they are smarter then the docs
telling them ICMP type 3 code 4 shouldn't be blocked or ignored.
>
> The 1424 MTU size was an attempt in circumventing the problem (which of
> course did not work - and was quite a stupid thing to do on my behalf) - We
> have changed that back to the normal 1452 size, and there is no need to
> change it to 1424 on Linux hosts... (BTW: we are sending this parameter over
> the PPP's LCP session, so the parameter can be changed automatically...)
>
Thats very nice and cooperative.
> Anyway, the problem was fixed by an upgrade to a newer software from RedBack
> - which has an option of ignoring the DF bit, and fragment packets even if
> is set (like is common with dialup RAS devices).
>
good to hear!
> Hope the solution came quick enough, and did not make you too angry with
> us...
>
> Arie Vayner
> Netvision - Network Engineering
Dani
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