Re: Download Packet Loss - stumped everyone

Author	All Replies
tkdslr join:2004-04-24 Pompano Beach, FL ·Speakeasy edit: November 24th, @09:26PM	reply to tyco Re: Download Packet Loss - stumped everyone said by tyco : Pings to the DNS servers don't really show any latency changes - I simply get a request timed out every so many pings. What is interesting is that at the normal ping size it only has issues every 25+ pings or more. As I increase the size it happens more frequently. Until I am just over 2k where it will timeout within 5-8 pings. Sometimes you see a large response time increase right before I get a request timed out - but usually it times out. The issue definitely shows itself with larger sized packets/downloads. That is a characteristic symptom of a routing loop.. »en.wikipedia.org/wiki/Routing_loops A misconfigured router is sending packets down the wrong pipe. When it gets to the other end it gets forwarded back the other direction or it may contain additional routers in the loop. This continues until the TTL countdown expires*(128 routing hops).. Each misdirected UDP packet causes intense bursts of full speed traffic along with a mess load of ICMP redirect packeta, and DNS lookups. Fresh (misdirected) packets are usually injected by one or more UDP based services and over time, multiple instances of these sservices have a tendency to sync up with one another. I.E.. If you're an admin, You'll see huge bursts of traffic peak losses at 1 minute intervals.. then 30 second intervals as the problem worsens, etc.. (I.E. the default timeout intervals for these services.)
	to forum · permalink · · 2007-11-23 17:18:23 ·
tyco join:2007-11-17	Thanks Tkdslr - do you know what I can do to see if a routing loop is happening? Or what I can ask speakeasy - or will they know what to check? Thanks in advance..
tyco join:2007-11-17	to forum · permalink · · 2007-11-23 22:52:14 ·
tyco join:2007-11-17	Well I was still having the issue last night until I went to bed around 11:30PM. I didn't try it this morning - but I came home from work today and boom - my connectivity is back. I am doing solid 3.3+ downloads again. I have not changed a thing at my house - at this issue was going on all last week and weekend. Any idea what could have caused it? I actually wish it was still happening since Covad is coming out this week to install a circuit - I wish they could have identified the issue so if it happens again I know what to tell them.
tyco join:2007-11-17	to forum · permalink · · 2007-11-26 21:42:25 ·


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