Re: Router

From: Alexander Clouter (alex_at_digriz.junk-this.org.uk)
Date: 03/29/05


Date: Tue, 29 Mar 2005 08:34:04 -0000

On 2005-03-28, Kevin Brown <-NOSPAM-itismekevinb-NOSPAM-@hotmail.com> wrote:
> Hello all,
>
> I am wondering what sort of experience anyone has had with Linux running
> a mission critical router? From experience, do you feel that it has
> the ability to route a DS-3 at wire speeds with very minimal to no
> packet filtering enabled? The hardware the router would run is a
> Celeron 2.6GHz w/ 256MB of RAM, a wanPCI-1T3 for the DS-3 and an Intel
> Pro network card.
>
Well at work we are using Linux with filtering for L2TP-PPP tunnels with BGP
routing for multiple 155Mbps ATM links. There is a seperate box stripping
off the ATM layer but apart from that we have two boxes half that spec
running each 155Mbps link. The two boxes load-balance and provide redunacy
for one another and of course there are plenty of spare CPU cycles.

The traffic over the pipes are lusers with their ADSL links so there is a
high packet cont going through.

I think you will find Linux performs rather well as a router.

> Not to start a flame war, but for routing, are the BSDs quicker, or are
> Linux and the BSDs very similar in speeds when it comes routing?
>
I have heard, but I do not know, Linux is faster than BSD as the zero-copy
packet handling and also that fact that the IP stack is SMP 'compatible' (it
spreads the routing across multiple CPU's) makes it rather fast.

Although it gives results for filtering, you might find the following useful:

http://www.hipac.org/

Cheers

Alex

> Thanks in adance,
> Kevin Brown.



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