Why am I getting terrible lag and/or high pings playing GLQuakeWorld/Quake2 since I started using a US Robotics X2 56K modem?

This is a well documented problem often referred to as POD (Ping of Death). US Robotics doesn't talk about it much but USR modems that use X2 compression don't like QuakeWorld or Q2 very much. The same problem can occur even if you don't have a USR X2 modem, but your ISP supports X2 modems - the ISP's X2 modems at the local server are the cause of the problem in that case.

Even more perplexing is the fact that this happens even when connected at speeds below 33.6K! This affects both regular QuakeWorld and GLQuakeWorld, but the problem seems much worse when playing on the latter. Not all Internet providers that support USR X2 modems have this problem (ISP's are aware of the problem and there's a few things they can do to keep their Quake playing customers happy, if they care to).

The problem can also come and go, which makes it even more mysterious and aggravating. Indications that you have an X2 problem are that you'll receive a lot of U_REMOVE errors during the game, along with wild ... more.

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