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I have inherited a badly designed network, and have to keep it up. There's a machine running VMWare, and a pfSense VMWare appliance is acting as firewall and NAT. The network in use inside this NAT is 10.0.0.0/14. The pfSense appliance has two more network adapters, one connected to the internet, and one connected to another physical machine on a 10.139.251.104/29 network. What I am tasked with is to make that external machine visible to other virtual machines running behind pfSense. I have been banging my head against the wall, trying to figure out what sort of a rule do I need to create in pfSense and other VMS (which are running CentOS) to make this happen. Can anyone give me any ideas?

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If you just need to expose some services running on the external machine then you could use Port Forwarding.

pfSense has a very straightforward web interface for doing that.

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  • My problem is, how can I instruct the VMs to send packets destined for 10.139.251.107 to 10.0.0.1 (the gateway) because at the moment they don't. I have tried adding a route like this: route add -net 10.139.251.104/29 10.0.0.1 but when I try traceroute 10.139.251.107 it doesn't go through 10.0.0.1 – iMan Biglari Nov 23 '16 at 1:19
  • Try this: route add -net 10.139.251.104 NETMASK 255.255.255.248 gw 10.0.0.1 – Vikelidis Kostas Nov 23 '16 at 7:18

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