I'm betting on Comcast being evil..... My connection was being throttled to 2MB down. While I was out of town, my step-son had problems and disconnected the firewall and connected his laptop directly to the cable modem and was able to get 10MB down. So I looked on the Smoothwall forums for a way to spoof the MAC address. I then proceeded to create 12 fictional MAC addresses and I comment out all but one at a time. Then I just reboot the Smoothwall and the cable modem and my download speed is back to 10MB. So far it's been 40 days with no decrease in speed. They'll probably mess with me the next time I want to use bit-torrent to download some more ISO images.... ---------- Todd Young ----- Original Message ----- From: "Jon Schewe" <jpschewe at mtu.net> To: "TCLUG List" <tclug-list at mn-linux.org> Sent: Monday, May 17, 2010 3:18:52 PM GMT -06:00 US/Canada Central Subject: [tclug-list] Comcast being evil or some bad hardware? I'm trying to capture some large files from my house (on Comcast) to a server out of state (not on Comcast). I'm copying the files using ssh and a non-standard port.Things are fine for files of a couple megabytes, but files over say 10 megabytes stall out part way through. One night I got 50MB uploaded all night! So today I started up tcpdump on both ends and captured the traffic. I noticed an interesting thing in wireshark when the connection stalled out. I got a "TCP Previous segment lost" message on the server side and then started getting "TCP Dup ACK" on both ends. The server has a SonicWall firewall in front of it and is virtualized with vmware. My house is using dd-wrt on a Linksys router as my connection. Is this Comcast doing it's filtering for our protection or is this just something misbehaving on either firewall? -- Jon Schewe | http://mtu.net/~jpschewe If you see an attachment named signature.asc, this is my digital signature. See http://www.gnupg.org for more information. _______________________________________________ TCLUG Mailing List - Minneapolis/St. Paul, Minnesota tclug-list at mn-linux.org http://mailman.mn-linux.org/mailman/listinfo/tclug-list