A little background. We have a Barracuda link balancer that connects us to the internet through two ISPs (one cable one DSL) for failover. We are going to have to move our entire server/networking close because of some remodeling to our office. We had a rep from the DSL company come out today and while he was looking at the modem he jiggled some wite and maybe pulled the power on the modem. Whatever the case we lost connection on the DSL. Not a big deal we mainly use the cable the DSL is just for emergencies.
Here is where the strangeness starts. One of our designers told me they weren't able to connect to FTP to update the websites. While investigating we found that all FTP traffic on the entire network was being redirected to one of our two FTP servers. It didn't matter what address you put in, all traffic for port 21 was going to the one server. This is true for any traffic originating inside and outside the network. As soon as any port 21 traffic hit our network it was being sent to the one server. Rebooting the DSL modem fixed the issue but how on earth could one malfunctioning modem that isn't even used by the majority of our traffic be able to redirect all the FTP traffic on the network?
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