Re: [squid-users] Squid and level 4 switch

On Tue, Jul 17, 2007, Ming-Ching Tiew wrote:
>
> Anyone has experience with level 4 switch ? What is the working
> principle of a level 4 in respect to redirecting web traffic to a cache
> engine ? Does it do dst IP address rewrite ( iptables DNAT ) or
> does it do dst MAC address rewrite ( ebtables dnat ) when redirecting
> traffic to the cache engine ?

You need to be more specific when you say "Layer 4 switch", as how it
does things depends entirely on the switch.

Cisco TCAM switches with L3 functionality will want to do L2 rewrite.
It'll rewrite the source/destination MAC address and send the packet off
to the cache for (potential) interception.

(Some Cisco kit will do GRE encaps rather than L2 rewrite via WCCPv2;
but then the GRE rewrite is done in software and scales poorly.)

Adrian
Received on Tue Jul 17 2007 - 00:12:23 MDT