Took me 20 minutes, but I got it solved.
Basically it was a guy who had been bounced between us (Qwest DSL Tech Support) & his ISP. His download speeds were great, his uploads were half what they should be & were timing out constantly. Customer is in bridging mode, line quality is great, no CRC's or RS corrected/uncorrected errors. Kick-ass connection, in other words, but his uploads suck. We say it's his ISP, his ISP says it's him. One of our techs tried to refer him to his ISP, he requested a supervisor.
Solution:
Customer has static IPs. Had him give me has static IP, & his default gateway on his ISP. Ping his IP from my gateway, which is sitting on top of a T1. Got pings in the 170 ms range, all within a few ms of each other. There's no way in HELL his pings should be that high, considering he's on 640/272 DSL & I'm on a T1. OK, ping his gateway. Whadda ya know, pings ranging from 70 ms all the way to 240 ms! 240 ms from my gateway to his. I know damn well my gateway's fine, the problem's gotta be at his ISP's gateway. Gave him the info, explained it step by step from him to the 'net & from me to him. It all made perfect sense, he thanked me for my time & assistance & we went on our merry ways.
Total time? 20 minutes.
Piece of cake.
And the really funny thing? How was his ISP testing his connection? By pinging him! They got good ping times, so they sent him to us. Umm... Let me see here... Who runs the connection between him & his ISP? None other than Qwest DSL.
Viper GTS