jumbo packets on em card.

[Jeremy Chadwick]

On Tue, Apr 29, 2008 at 05:43:42PM +0530, Sharad Chandra wrote:
>  ,---- [Jeremy Chadwick wrote:]
> | On Tue, Apr 29, 2008 at 04:13:13PM +0530, Sharad Chandra wrote:
> | > I am getting a problem in setting em card to 1000baseTX. It shows "active
> | > status" with 100baseTX but as soon as i run "ifconfig em1 media
> | > 1000baseTX mediaopt full-duplex", it says *no carrier*. how can i set it
> | > to 1000base?
> |
> | The PHYs support auto-negotiation of speed and duplex, as per the 802.3
> | standard.
> |
> | Do you have a gigabit switch?  If so, does auto-negotiation (e.g. no
> | "mediaopt" or "media" settings) work?  If not, is the switch a managed
> | switch?  If so, try explicitly setting the port on the switch to
> | 1000mbit, full duplex.  If not, then consider buying another switch.
> | Many consumer/residential switches do not do auto-negotiation properly,
> | resulting in "no carrier" or worse (bad throughput).
> 
> No, I am not using any switch. It is back-to-back connection. It is only 
> requirement for me.

By "back to back" you mean you're connecting two PCs together with a
proper crossover cable?  Is it CAT5e at least?  What PHY and NIC are on
the opposite end of the em(4)?

-- 
| Jeremy Chadwick                                jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |