Strange static problems.

I have a PIX of four ports, inside, outside, dmz1, dmz2.

DMZ1 use 192.168.200.0, dmz2 use 192.168.100.0

There are a few static commands configured like this.

static (inside, dmz2) 192.168.0.0 255.255.0.0 192.168.0.0 255.255.0.0

static (inside, dmz1) 10.0.0.0 255.0.0.0 10.0.0.0 255.0.0.0

static (inside, dmz2) 10.0.0.0 255.0.0.0 10.0.0.0 255.0.0.0

-We're not dmz1 hosts do 192.168.x.x hosts within the network.

-I also NAT/Global installation for 192.168.200.0 for outside access.

OK, now hosts on DMZ1 (i.e. 192.168.200.10)

can communicate with all 10.x.x.x hosts inside.

But no traffic happens on the outside.

If I remove the 192.168.0.0 static (inside, dmz2) command, dmz1 guests out.

Why?

With this command:

static (inside, dmz2) 192.168.0.0 255.255.0.0 192.168.0.0 255.255.0.0

you say the PIX as the entire network 192.168.0.0/16 is connected inside interface, what's not. When a package arrives in the PIX, the PIX uses the translation table to see what that interface to send it to. Using a static command creates a permanent entry in the table of translation of the PIX, so when a package arrives in the PIX to 192.168.200.x the PIX inside interface, NOT the dmz1 interface will pass. This translation entry overrides the routing table and even directly configured subnet, so it is essential that you get your correct static.

If you have no other subnets of 192.168.0.0 connected inside interface, then you will need to add a specific for 192.168.200.0 translation saying that he is on the dmz1 interface, or create several static instructions defining the 192.168.0.0 network except 192.168.200.0 and 192.168.100.0.

Statics are read from top to bottom, so if you have this in your config file:

(dmz1, dmz2) static 192.168.200.0 255.255.0.0 192.168.200.0 255.255.0.0

static (inside, dmz2) 192.168.0.0 255.255.0.0 192.168.0.0 255.255.0.0

static (inside, dmz1) 10.0.0.0 255.0.0.0 10.0.0.0 255.0.0.0

static (inside, dmz2) 10.0.0.0 255.0.0.0 10.0.0.0 255.0.0.0

then one will be read first and all should work OK. You may need to clear out your static existing and then cut and paste that all back in to get them in the right order. DMZ1 will still not be able to get inside.

Tags: Cisco Security

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