Code is in sessions.c handleTCPSession(), starting around line 2162. It's
computed for the 3rd packet of the 3-way handshake:
/* Latency measurement */
if((tp->th_flags == (TH_SYN|TH_ACK)) && (theSession->sessionState ==
FLAG_STATE_SYN)) {
theSession->sessionState = FLAG_FLAG_STATE_SYN_ACK;
} else if((tp->th_flags == TH_ACK) && (theSession->sessionState ==
FLAG_FLAG_STATE_SYN_ACK)) {
if(h->ts.tv_sec >= theSession->nwLatency.tv_sec) {
theSession->nwLatency.tv_sec =
h->ts.tv_sec-theSession->nwLatency.tv_sec;
...
There are lots of reasons why ntop might not see / have seen the setup
packets for a connection. There are also sanity checks in that code that
could be causing packets to be ignored...
-----Burton
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
marco pozzi
Sent: Tuesday, September 13, 2005 8:03 AM
To: [EMAIL PROTECTED]
Subject: [Ntop] Ntop Lantency
Hi,
why the latency is displayed only for some of the active sessions?
On which basis is it displayed?
Thanks in advance
Regards
Marco
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