RE: NAT over vlan problem
"Jamie ffolliott" <[email protected]>
| Newsgroups | gmane.linux.drivers.vlan |
|---|---|
| Message-ID | <[email protected]> |
> On Wed, Aug 03, 2005 at 06:39:43PM -0400, Jamie ffolliott wrote: > > All vlan interfaces and eth0 have mtu set to 1480, to deal with > > oversize ethernet frames from 802.1q's extra 4byte header. > > I believe this is the problem. > > Try leaving the MTU at 1500 and using the e100 driver, not eepro100. Yes, that took care of it! > The e100 driver takes care of the oversized packet problem so no MTU > compensation is neccessary. excellent, thanks for the help. > The fact that small packets come through properly also indicate that > the problem is MTU related, since the http packets will have the > maximum allowed size. I thought mtu related, but local network access simply wouldn't work with the eepro100 driver and an mtu of 1500, it needed 1496 or less I believe. Setting back to 1500 worked fine with the e100 driver, and now SNAT also works. > Admittedly, when adjusting the MTU down there should be no problem, > but unless you make the same adjustment on _all_ interfaces on that > layer 2 network I guess Linux will be unhappy when large packets > (over 1480 bytes, but under 1500 bytes which is the MTU at the > sender) arrive, just like when the driver/NIC do not handle this > properly for packets > 1500 bytes. > > > //Peter > _______________________________________________ > Vlan mailing list > [email protected] > http://www.lanforge.com/mailman/listinfo/vlan >