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Watchguard x750e Configuration Issues

Posted on 2008-10-06
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Last Modified: 2013-11-16
Hi,

We've inhireted a network which uses the IP range 137.121.82.0 /24, we're trying to configure a new x750e using this range as the Trusted network. On the External, we have a /29 subnet of IPs to use.

The current configuration is as follows :

Eth 1 Trusted Interface : 137.121.82.230 /24
Eth 0 External Interface : This is using the PPPOE client and obtaining details via DHCP.

The problem is that traffic is not being routed externally. When configured as follows :

Eth 1 Trusted Interface : 192.168.2.1 /24
Eth 0 External Interface as above, PPPOE with IP via DHCP, traffic is being routed fine.

What could be the issue here?
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Question by:SBSNetworks
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dpk_wal earned 2000 total points
ID: 22656668
By default the dynamic NAT is only allowed from the private IP ranges, viz.:
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

As you have 137.121.82.0 /24 on trusted; you need to go to Policy Manager; Network->NAT; and add 137.121.82.0 /24 to be allowed as:
In Policy Manager; go to Network->NAT; click Dynamic NAT tab; click Add; add entry as:
From: 137.121.82.0 /24; to Any-External

Move up if you wish [doesn't matter]; save settings to firebox. I would like to point out to you a potential problem with this configuration, if on internet there exists some server(s) which is/are running on same IP subnet 137.121.82.0 /24; then you would not be able to access that server when behind firebox.

Please implement and update.

Thank you.
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Author Closing Comment

by:SBSNetworks
ID: 31503514
Many thanks for this, this was exactly what solved the issue, you've been a great help.
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