sisco wrote: > > gurus, :) > Is ping/icmp protocol needs to be prioritized on Lan > environment just > to have a good latency ping result? is it ping a good basis for > measuring > your > network if it is congested? Thanks!
Ping can help you understand if a network is congested if it's just a simple LAN. On a LAN, you probably don't have to worry about prioritization. In fact, there aren't many ways to prioritize a particular traffic type on simple Ethernet LANs. If it were an entire internetwork, then prioritization might be relevant. A switch shouldn't bother with such things, but a complicated switch might. Routers can prioritize traffic and often do. If you ping a Cisco router, it will not prioritize responding and in fact may rate limit ICMP activity. If you ping through a router, you might also see extra delay if the router is implementing some policy regarding ICMP. Firewalls might also add some delay or even stop pings. So on an internetwork, including the Internet, ping isn't really a good test. The other caveat, and this applies to both simple LANs and complex internetworks, is that the end hosts may treat ping differently than the actual applications that get used for real work (or play! ;-) So, to get the best results, you should test with the applications that you are concerned about. On a simple LAN, you can get approximations with ping, though. Gamers always use this! (though they probably consider it more important than they should because they haven't considered the caveats mentioned above.) Priscilla > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=63944&t=63934 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
