Re: running OpenBSD on switch hardware

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From: Claudio Jeker
Date: Friday, April 6, 2007 - 3:09 am

On Fri, Apr 06, 2007 at 02:54:03AM -0600, rc wrote:

Oh please. A managed switch is not even closely able to run PF especially
those cheapo Linksys thingis with a massivly under powered ARM CPU with
probably a hopping 64M RAM.

Switching chips are built for switching packets. They read the mac header
and managed switches the vlan header. Expensive Layer 3 switches will
read the dest IP header. These infos are used to do a lookup in a CAM
table and based on that result forwarding is done. The CPU will only see
packets that can not be handled in HW (e.g. because there is no CAM
entry).

Even the most expensive Cisco/Foundry/Extreme switches have not the CPU
power to route or filter packets.

Sure you could use a good L3 switch chip and combine it with a modern CPU
(amd64 or core 2 duo) but that's an other story.
-- 
:wq Claudio

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Messages in current thread:
running OpenBSD on switch hardware, RedShift, (Thu Apr 5, 8:17 am)
Re: running OpenBSD on switch hardware, Karl Sjödahl - dunceor, (Thu Apr 5, 9:52 am)
Re: running OpenBSD on switch hardware, Siju George, (Thu Apr 5, 5:34 pm)
Re: running OpenBSD on switch hardware, Douglas Allan Tutty, (Thu Apr 5, 5:51 pm)
Re: running OpenBSD on switch hardware, Steve Shockley, (Thu Apr 5, 7:22 pm)
Re: running OpenBSD on switch hardware, Sam Fourman Jr., (Thu Apr 5, 7:32 pm)
Re: running OpenBSD on switch hardware, Diana Eichert, (Thu Apr 5, 8:48 pm)
Re: running OpenBSD on switch hardware, Karl Sjödahl - dunceor, (Thu Apr 5, 11:36 pm)
Re: running OpenBSD on switch hardware, rc, (Fri Apr 6, 12:14 am)
Re: running OpenBSD on switch hardware, RedShift, (Fri Apr 6, 12:25 am)
Re: running OpenBSD on switch hardware, RedShift, (Fri Apr 6, 1:26 am)
Re: running OpenBSD on switch hardware, rc, (Fri Apr 6, 1:54 am)
Re: running OpenBSD on switch hardware, tb@tbits.net, (Fri Apr 6, 1:56 am)
Re: running OpenBSD on switch hardware, Stuart Henderson, (Fri Apr 6, 2:08 am)
Re: running OpenBSD on switch hardware, Claudio Jeker, (Fri Apr 6, 3:09 am)
Re: running OpenBSD on switch hardware, Siju George, (Fri Apr 6, 3:51 am)
Re: running OpenBSD on switch hardware, RedShift, (Fri Apr 6, 4:35 am)
Re: running OpenBSD on switch hardware, Reyk Floeter, (Fri Apr 6, 4:38 am)
Re: running OpenBSD on switch hardware, Toni Mueller, (Fri Apr 20, 12:48 am)
Re: running OpenBSD on switch hardware, Stuart Henderson, (Fri Apr 20, 1:36 am)
Re: running OpenBSD on switch hardware, Claudio Jeker, (Fri Apr 20, 1:42 am)
Re: running OpenBSD on switch hardware, Pete Vickers, (Fri Apr 20, 3:53 am)