North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: level3.net in Chicago - high packet loss?!?
Stef, > -----Original Message----- > From: Network Fortius [mailto:[email protected]] > Sent: Tuesday, September 06, 2005 10:25 AM > To: [email protected] > Subject: Re: level3.net in Chicago - high packet loss?!? > > > > And how exactly would you interpret the number returned by net_loss > (int), in a column called "LOSS", in reference to reachability of a > "hop" between two end points: > > int net_loss(int at) > { > if ((host[at].xmit - host[at].transit) == 0) > return 0; > /* times extra 1000 */ > return 1000*(100 - (100.0 * host[at].returned / (host[at].xmit - > host[at].transit)) ); > } ? This piece of code is modified by me (all mistake is mine). It converts the the drop to percentage. x 1000 was a trick to handle none int returned by the function. This was an issue I did not have a clear answer. Regarding to you original post. Your trace end2end (last hop) has 0.0% drop proved the entire path was free of packet loss. The drop in the middle of the path could be related to ICMP rate limit or other things. Should it was a congestion in the X hop, every hop after X would be impacted by it. Thus X+1, X=2... has to be > 0.0%. Hope this help, Min > > Thanks, > Stef > Network Fortius, LLC > > > On Sep 6, 2005, at 7:45 AM, Robert E.Seastrom wrote: > > > > > Network Fortius <[email protected]> writes: > > > > > >> Anybody having any idea why such a high packet loss on lever3's > >> network, in Chicago? > >> > > > > End-user misinterpreting output from MTR. This network does not > > appear to have any packet loss end-to-end. > > > > ---Rob > > > > > > > >> Stef:~ scm$ mtr -r www.yahoo.com > >> ... > >> tbr1-p010802.cgcil.ip.att.net 0% 16 16 15.12 > >> 24.21 49.26 > >> ggr2-p310.cgcil.ip.att.net 0% 16 16 13.18 > >> 42.66 118.99 > >> so-1-1-0.edge1.chicago1.level3.net 0% 16 16 14.48 > >> 35.84 126.48 > >> so-2-1-0.bbr1.chicago1.level3.net 63% 6 16 14.44 > >> 43.74 79.97 > >> > > >> ^^^^^^^ > >> as-1-0.bbr2.sanjose1.level3.net 0% 16 16 61.95 > >> 80.64 176.01 > >> ge-10-2.ipcolo3.sanjose1.level3.net 0% 16 16 63.37 > >> 95.61 148.46 > >> unknown.level3.net 0% 16 16 63.34 > >> 86.46 168.62 > >> unknown-66-218-82-217.yahoo.com 0% 16 16 62.09 > >> 88.91 127.58 > >> p4.www.scd.yahoo.com 0% 16 16 64.51 > >> 89.96 183.79 > >> > >> TIA, > >> Stef > >> Network Fortius, LLC > > > > |