[PATCH] TcpRtt support in ragraph

[Tomoyuki Sakurai]

On Mon, Aug 25, 2008 at 09:40:07AM -0400, Carter Bullard wrote:
> 
> Did you get interesting graphs for your TcpRtt metrics?  Do they  
> appear to be
> reasonable for your experiments/observations?

The reason I wrote the patch was that TcpRtt looked weired while I had
been watching TcpRtt and sCo.

Case 1:

external clients -> argus -> my servers

Almost all TcpRtt values are a few msec, even when the client is outside of
Japan like web crawlers. Argus is running on my router. My servers are
just 1 hop away from the router.

Case 2:

internal clients -> argus -> external servers

TcpRtt looks reasonable, 10 - 30 msec for domestic hosts, 100 - 300 msec
for hosts in the U.S. or EU.

My guess is that argus reports RTT between argus host and dst host, not
src host and dst host.

The router has two NICs, one (NIC 1) for the upstream and the other (NIC
2) for DMZ and internal networks. The argus monitors NIC 2.

-- 
Tomoyuki Sakurai