On Tue, Jun 15, 2004 at 05:41:31PM +1000, Edwin Humphries wrote: > We've done that. > > The log showed problems in negotiating a https session - which the > DSl guy said was a frequent outcome of packet fragmentation. > > The ping showed that 1464 bytes was the critical point. But it also > showed that same level on the router that works fine. > > What we really need to know is how to set the MTU value for the ppp0 > interface. With that, we can try different levels and find the > largest one that works.
have you tried ip
asamadlx:/proc# ip li help
Usage: ip link set DEVICE { up | down | arp { on | off } |
dynamic { on | off } |
multicast { on | off } | txqueuelen PACKETS
|
name NEWNAME |
address LLADDR | broadcast LLADDR |
mtu MTU }
ip link show [ DEVICE ]
although I am not sure it it works on ppp interface's, but I am pretty
sure the pppoe client has an option to set the outgoing mtu as well or
as somebody else stated iptables
>
> On 15 Jun 2004 at 17:21, Alexander Samad wrote:
>
> > On Tue, Jun 15, 2004 at 05:19:21PM +1000, Edwin Humphries wrote:
> > > G'day,
> > >
> > > We're setting up a RH7.2 router on a Bigpond ADSL connection,
> using
> > > rp-pppoe. We're experiencing a problem that some sites (eg,
> Google,
> > > Bigpond) load fine on the network clients, but others (eg,
> Telstra,
> > > Pacific.net.au) only load on the router itself (lynx) or on
> network
> > > clients that are set to use the router's proxy. Ping and ssh work
> > > fine from the clients.
> > >
> > > We've been able to reproduce the problem on our own in-house
> > > (Fedora) router, by changing the CLAMPMSS setting from "1412" to
> > > "no". However, the CLAMPMSS setting on the new router is already
> set
> > > to "1412".
> > >
> > > The Telstra DSL guru (yes folks, there is one, and he speaks
> Linux!)
> > > has suggested changing the MTU size in the pppoe client.
> > >
> > > Where do we go from here? The ifcfg-ppp0 file on the new router
> has
> > > a MTU="" line: do we set this to 1412, or do we progressively
> reduce
> > > the CLAMPMSS setting until it works?
> >
> > Might be helpful to take a dump of the traffic on the router.
> Maybe
> > the next thing to to try the ping test with do not Fragment and set
> > the size to 1412 and then decrease
> >
> > A
> >
> > >
> > > Edwin Humphries,
> > > Ironstone Technology Pty Ltd
> > > [EMAIL PROTECTED]
> > > www.ironstone.com.au
> > > Phone: 02 4233 2285
> > > Fax: 02 4233 2299
> > > Mobile: 0419 233 051
> > > --
> > > SLUG - Sydney Linux User's Group Mailing List -
> http://slug.org.au/
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> > >
> >
>
>
> Edwin Humphries,
> Ironstone Technology Pty Ltd
> [EMAIL PROTECTED]
> www.ironstone.com.au
> Phone: 02 4233 2285
> Fax: 02 4233 2299
> Mobile: 0419 233 051
> --
> SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/
> Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
>
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