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Accessing the servers via their WAN IPs from the internal network - connect them to LAN too?

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http://serverfault.com – Currently we have a few servers behind a router/gateway, which is in bridge mode, so the servers have directly assigned WAN IPs with no NATting performed. This works as expected. There is, however a separate office computer network behind a separate gateway, which is connected to the internet via the same router as all the servers. Here's the simplified scheme: Basically, this means that since the office gateway is connected to the same switch as the servers, they can connect to the servers via their WAN IP without going through the main internet firewall. This is desired and it makes many (HowTos)