From: "Adrian Chadd" <adrian@xxxxxxxxxxxxxxx> > 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. > I got the word "level 4 switch" from someone who knows nothing else, so I have to make guesses too. But I would imagine that it is doing L2 rewrite. Care to elaborate how the L2 rewrite in Cisco TCAM works ? Does it constantly do arp request based on IP of the cache engine and update the MAC address accordingly ( much like ip routing does ) or it statically configure the the mac address of the cache engine ? Regards.
