08-06-2009 08:18 PM - edited 03-04-2019 05:40 AM
Hello,
We are trying to download ubuntu via bit torrent on our Cable internet connection.
This router is connected directly to the modem.
After a few minutes all traffic gets halted. I can console into the router and can't ping out anymore. When the torrent is running the CPU never gets above 24% on the router. We have a 20mb connection and we never get above 800KB with like 50+ seeders.
I have seen 2 different links from Cisco that quote 50mb and another quotes 12mb so I doubt we are beating up this router.
Please find the relevant information attached which shows the troubleshooting steps which I took.
08-06-2009 09:16 PM
It is not a performance problem, it's a bug, likely some data structure gets corrupted in presence of many connections.
Upgrade IOS and hope it won't happene again.
08-06-2009 09:37 PM
This version of IOS is supposed to be the most stable and I have tried many others and I get the same result.
Just doing normal speed tests from testmy.net and dslreports I never get over 6mb so I am guessing there is something else wrong with it.
Thanks!
08-06-2009 09:45 PM
The cable modem, is doing NAT also, or do you get a public IP on fa4 ?
What is the reason you reduced tcp mss to 1452 ?
How do you recover from this loss of connectivity ?
08-06-2009 10:58 PM
The cable modem hands out a public IP address.
I have just testing different MTU values I was messing with TCP values which didn't make any difference.
The only way to recover is with a reload. This has happened on 12.4(3) (9) and now (24). I have even tried the advanced security and advanced IP services and it still continues to happen.
08-07-2009 03:47 AM
Do not assume these are stable release just because someone says so.
Certain bugs go undetected or un-acknowledged by cisco until someone is persistent enough to prove his case.
I use 12.4(9)T7 on a 851w without issues, but often you have better results going backward in trying releases.
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