RE: [lwip-users] Jumbo frame questions

[Bill Auerbach]

Thanks,
 
Bill Auerbach
 

> On Tue, 2008-02-05 at 15:23 +0000, Kieran Mansley wrote:
> > This could be construed a bug
> > (especially if we also set the DF - Don't Fragment - bit in the header)
> > but could also be seen as a property of lwIP being "lightweight".
> 
> I've just checked - we don't send the DF flag, and so the network should
> fragment the packet if necessary.  That it's not suggests that you might
> have the two nodes on the same LAN.  If that's correct, then you've got
> a configuration error: all nodes on the same LAN are supposed to have
> the same frame length and MTU, and it sounds like you've put the lwIP
> node with an MTU of 9000 on a network with an MTU of 1500.  That just
> doesn't work I'm afraid.

Could it be that my router sees 2 jumbo frame supporting Ethernet adapters
(PC and PPC) and is allowing jumbo frames, but with any other normal
adapter, fragmenting?  I can't explain why my PC has jumbo frame support and
can access my LAN and WAN.

Bill