Re: refresh ad
From: jas0n (no_at_email.here)
Date: 12/07/04
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Date: Tue, 7 Dec 2004 08:09:43 -0000
In article <#YaC1M$2EHA.824@TK2MSFTNGP11.phx.gbl>,
PleaseSubstituteMyActualFirstName&LastNameHere@hotmail.com says...
> In news:MPG.1c1ee43c135894c99896eb@news.gradwell.com,
> jas0n <no@email.here> made a post then I commented below
> > In article <95DA4CDD-A532-4943-A72B-07CB2E5E3D1B@microsoft.com>,
> > AndreiUngureanu@discussions.microsoft.com says...
> >> To avoid fragmentation Cisco VPN Client will reduce the MTU to 1300
> >> on all adapters. I hope this is the key to your problem.
> >>
> >> Andrei Ungureanu
> >> www.eventid.net
> >
> > it could well be ... one of the first things the folk who look after
> > the cisco adsl router did was to alter the mtu on it to improve
> > performance from an adsl line so i was told .... this was before
> > swapping the router for another known working one.
> >
> > we have lots of sites they look after all going through the same vpn
> > concentrator/pix setup and the other sites were not experiencing this
> > issue ....
> >
> > i say were not .... i have been informed that 2 other sites are
> > exhibiting similar issues so for an interim measure i told them to
> > install the cisco client vpn software until we can identify it - i'll
> > have to check it solved their issues tomorrow.
> >
> > so, i guess its a call into the adsl provider in the morning and get
> > their take on mtu settings for their network considering the adsl
> > which is theirs terminates on a large leased line pipe which is also
> > theirs ...
> >
> > should they be the people to dictate the correct mtu or is it a matter
> > between adsl router and receiving vpn concentrator?
>
> ADSL is a known issue with reduced MTUs. PPPoE requires an 8 byte header
> that reduces the MTU to 1492 from the default TCPIP packet size of 1500. It
> can't be changed in the ADSL modem/router. For a corporate infrastructure I
> would suggest to look into SDSL, a lease line, or even cable, which do not
> require this overhead.
>
> To test your current MTU settings, see this link:
> MTU - How to test and how to set in registry:
> http://gw.renner.bei.t-online.de/windowsxp/mtu.htm
>
> Some info on ADSL PPPoE and MTUs:
>
> Optimal MTU configuration for PPPoE ASDL Connections:
> http://www.mynetwatchman.com/kb/ADSL/pppoemtu.htm
>
> Troubleshooting MTU Size in PPPoE Dialin Connectivity-ADSL - Cisco ...:
> http://www.cisco.com/en/US/tech/tk175/tk15/technologies_tech_note09186a0080093bc7.shtml
>
>
> --
> Regards,
> Ace
thanks for the links .... that cisco link seems to describe the
situation im getting with the web traffic ... i'll be getting this
looked at in some detail later today.
cheers all.
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