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gr8sk8

join:2010-02-23
Bloomfield, NJ
reply to norrikkarn

Re: Comcast and BitTorrent

I have noticed the same thing happening to me in the last month and it looks like either Comcast is disconnecting my modem when it detects bittorrent traffic, or I have something wrong with my cable modem.

When the disconnect occurs I can log into my router's web ui and see that everything on my internal network is fine, the CPU on the router isn't maxed, nor is the number of connections. I know it's a disconnect because the modem loses it's IP address, if I do a DHCP renew on the WAN, I'll get an IP address of 192.168.100.2 until the modem reconnects, and then I get a normal Comcast IP address.

My cable modem is a Motorla SB5100. I haven't had any problems torrenting heavily in the past, this is something new. I have read somewhere that there might be a bug in a version of the SB5100 firmware, that the modem will freeze or reset from a large number of connections. Unfortunately, I understand it's not something a customer can upgrade, or am I misinformed? I read that the firmware is only made available to ISP's like Comcast - do I have any hope of asking them to push the latest firmware to me if this is a customer owned modem?

I haven't called them yet - I'm not sure their phone support would be able to do anything to help. If it's an active disconnection on their part, I'm sure they'll deny it. Would switching to Verizon FiOS help, or will all ISP's eventually throttle torrent traffic?

OP - Is your modem rented from Comcast, or do you own it? Has anyone else noticed a problem with torrent causing disconnects on Comcast in the last couple of months?



JohnInSJ
Premium
join:2003-09-22
San Jose, CA

said by gr8sk8:

I have something wrong with my cable modem.
It's this. Comcast long ago figured out that picking on a protocol wasn't the right plan, and instead implemented a far simpler, fair, and sane system that changes your packets to a lower priority under specific conditions.

Bittorrent is more then capable of overwhelming cheap routers and modems if either is even remotely marginal, at very high bit/connection rates.

With very careful tuning of my SMC8014, I have 0 issues running torrents over a 12/2 connection. When I was having hardware issues with my 8014, torrents were the easiest way to reproduce the modem issue, since they stressed the hardware most.

To troubleshoot, remove everything from your network, isolate the modem

(pc) -cat5/6-> modem -> coax from the wall...

Run your torrent(s)

Modem falls over? Replace modem.
--
My place : »www.schettino.us


nerdburg
Premium
join:2009-08-20
Schuylkill Haven, PA
kudos:1

I agree 100% about the routers, but I don't know how a router would make a modem puke.
--
[Insert Comcast employee disclaimer here.]


muranternet

join:2009-10-19
Saint Paul, MN
Reviews:
·Comcast Business..
reply to JohnInSJ

said by JohnInSJ:

With very careful tuning of my SMC8014, I have 0 issues running torrents over a 12/2 connection. When I was having hardware issues with my 8014, torrents were the easiest way to reproduce the modem issue, since they stressed the hardware most.
John would you mind posting your configuration? I have noticed odd behavior when stressing and am trying to determine if it's an 8014 config issue or a local stack problem.


chong67

join:2001-11-18
Jonesboro, GA

I sure would not want to stick my head out in the sand and wave and said "here I am, come get me".



JohnInSJ
Premium
join:2003-09-22
San Jose, CA
reply to muranternet

said by muranternet:

John would you mind posting your configuration? I have noticed odd behavior when stressing and am trying to determine if it's an 8014 config issue or a local stack problem.
Sure, its pretty much in the "turn it all off" mode. I have static IPs, and I use a Linux box as my router/firewall. I have torrents set to use unlimited down, and 50% of the uplink, max 200 (or 250?) connections per torrent. I'll post the exact settings later today.
--
My place : »www.schettino.us


JohnInSJ
Premium
join:2003-09-22
San Jose, CA
reply to chong67

said by chong67:

I sure would not want to stick my head out in the sand and wave and said "here I am, come get me".
What do you mean?
--
My place : »www.schettino.us


heat84
Bit Torrent Apologist

join:2004-03-11
Fort Lauderdale, FL

3 edits

said by JohnInSJ:

said by chong67:

I sure would not want to stick my head out in the sand and wave and said "here I am, come get me".
What do you mean?
I think he 's talking to me. See my previous post.
Or maybe he's saying anybody that uses Bit Torrent shouldn't confess it here.

I would've went over 400GB again this month(I still have an outside chance) if not for the 40 year old breaker box in my house being on its last legs and causing the server PC to shut off. It doesn't turn back on for some reason either. Maybe I should have the power failure setting whatever its called in the BIOS set to Power-On instead Last State? I'm going for 500GB next month.
--
Bit Torrent is my DVR.