On Thu, 2002-03-28 at 08:48, Roman Hochuli wrote: Yeah, i see that problem too with SonicWall firewalls. Actually i use ip mtu 1492 + mtu 1492 on FE interfaces. It's work perfectly with lots of products, only some modems are craps. The only problem with the ip mtu command is that it can't stay fixed in the router config when you reboot.
Regards, Nicolas > Hello > > > The MTU is 1500. The ADSL Router adds 8 bits for > > encapsulation for PPPoE, this gives a total of 1508. Since > > this is more than the 1500, the packet doesnt go thru. The > > solution is to reduce the MTU size (on the MS Exchange Machine?) > > to 1492. > > > I had the same exactly the same problem with some gre-tunnels over a > cable environment. > > The funny thing was only very little traffic did not pass thuru the > tunnel. I found two scenarios for this. > First: it was traffic which gone first thuru a watchguard firewall. > Since the set a df-bit to every packet some bigger packets were unable > to come thuru. This problem occured on point-to-point connections over > the cablenetwork. > Second: was mostly the same as the first but from the internet into the > network thuru a tunnel. The best candidate for testing was the bluewin > homepage (sorry, alain) since their traffic seemed to come always set > with df for some time. This has been changed about a three-quarter year > ago as far as i can remember. > > The only solution was a command called 'ip mtu 1500' which instructs the > router to fragment tunnel-traffic even when there is a df-bit set. This > command is available in 12.1.5T and above. > > I suspect this is not a solution in your case but maybe it gives you > hint where to search for your issues. I had to go on site with a > lan-analyzer for quite some time so find that out. > > > Have nice holidays. > > -- > Kind regards, > Roman Hochuli > > GPS-Technik AG > Z�rcherstrasse 139 > 8952 Schlieren > Switzerland > Tel +41-1-7329977 > Fax +41-1-7311840 > X-NCC-RegID: ch.gps > > ---------------------------------------------- > [EMAIL PROTECTED] Maillist-Archive: > http://www.mail-archive.com/swinog%40swinog.ch/ -- ---------------------------------------- STRINA Nicolas VTX Services - Internet Service Provider Av. de Lavaux 101 CH-1009 Pully [EMAIL PROTECTED] http://www.vtx.ch ---------------------------------------- ---------------------------------------------- [EMAIL PROTECTED] Maillist-Archive: http://www.mail-archive.com/swinog%40swinog.ch/
