SRP521W Advanced Firewall Bug?

Using a SRP251W-U 1.2.5 firmware

I forwarded the two ports, one is a simple port 22 to the local LAN Server.  The other is a port forward for the external port 81 internal port 80 on the same LAN Server.

Using the configuration of the network-> Firewall-> IPV4-> firewall settings advanced

I would like to only allow certain ip access source for shipments of two ports.  I have the following rules:

Priority 1 - Source: x, x, x, x - Dest 0.0.0.0 - Proto THAT ALL - Source Port ALL - Dest Port 81 - PERMIT

Priority 2 - Source: x.x.x.x - Dest 0.0.0.0 - Proto ANY - ANY Source - Dest Port 22 - DRIVER port

Priority 3 - Source: 0.0.0.0 - 0.0.0.0 - Proto ALL Dest - Source Port - Dest Port 22 - DENY

Priority 4 - Source: 0.0.0.0 - 0.0.0.0 - Proto ALL Dest - Source Port - Dest Port 81 - DENY

The above rules work very well to block port 22.  Only the IP address of x.x.x.x can reach port 22 - perfect.

The problem is the rule for port 81 does not work. Each IP can reach port 81.

Y at - it a bug in the advanced firewall rules or NAT rules making sure if you translate an external port which differs by an internal port that does not have the advanced firewall?

I need the ability to NAT port forward external port 81 to internal port 80 AND only allow that some sources IPs to be able to access the external ports 81.

Hi Dan,.

It can be a little confusing, but the thing you have to remember with advanced firewall rules is that they are applied after the NAT translation.

If you change your first rule to reflect the internal address of the destination server and use port 80 as the port of destination, you should find that it works.

Rule 22 port just happened to work that you not convert that one.

Although this might seems a little backwards, it offers more flexibility because it allows to create different rules for internal hosts sitting behind the same public IP address.

HTH,

Andy

Tags: Cisco Support

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