The security relevance might be that some company policies require redundant internet connections, should one ever go down. A solution to the problem would be to use iproute2 for "source based routing" (http://www.tldp.org/HOWTO/IP-Masquerade-HOWTO/iproute2.html). HTH Chris

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has anyone of you ever used 2 Internet-Connections at the same time ? I do not see the security relevance here. Best you find a more apropriate list.

Peter