Try some decent Intel NICs.  Realtek and a 3c905 is very questionable.

Josh Luthman
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On Sun, Nov 11, 2012 at 9:38 PM, Jeromie Reeves <[email protected]>wrote:

> I have a x86 router that I upgraded to 5.21 today (was at 3.30). I did
> this under the advice that the newer version had newer
> NIC drivers and had the support for larger MTU's that I am needing for
> MPLS. Well, Nope. These are the NICs and the MTU
> is max 1500. This box under arch linux/pfsense is able to change the
> MTU on the interested interface so I know the linux drivers
> support a larger MTU. Any ideas what I am doing wrong?
>
> RTL8139 Ethernet (rev: 16)
> RTL-8139/8139C/8139C+ (rev: 16)
> NC100 Network Everywhere Fast Ethernet 10/100 (rev: 17)
> 3c905 100BaseTX [Boomerang] (rev: 0)
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> Visit http://blog.butchevans.com/ for tutorials related to Mikrotik
> RouterOS
>
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