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
