Quote:

In fact, you shouldn't have to do that source-based routing except for that your ISPs (or theirs) have intentionally broken open routing by denying packets whose source addresses aren't in their whitelist.



In the UK this applies pretty much all broadband users. British Telecom, who supply the lion's share of ADSLs in the UK decided some time ago to add source filtering to much of their core network, thereby breaking the setup for a whole load of people binding two lines.
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