I have a question, is it possible to write a rule that matches only a part of the IP address? For example match any IP ending in .51? Using wildcards this would be *.*.*.51
Put another way, i would like to match all IP's that are x.x.x.51 where x is any number. Someone in our teams suggested using 0.0.0.51/32 but this does not work, although there are 0.0.124.0 type rules in our firewall.
Can you clarify if it's possible to match on only a specific part of an IP address and if so how is this done?
Solved! Go to Solution.
I hope 0.0.0.51/32 will not work, since this indicates a specific host /32 ip address ( only 0.0.0.51 ip address). Regex will also not work, because it requires at least 7 byte fixed data patterns.
In Regex, every pattern you create must contain at least a 7-byte string with fixed values.
o The 7-byte fixed string can be anywhere in your pattern.
o The 7 values must be fixed, this means no ‘.’ (dot), no ‘*’ (star), no ‘+’ (plus), or other wildcard characters within the 7 bytes. Hence, it will not be applicable for the mentioned IP address 0.0.0.51/32.
Hope this helps.
Here is the details of the feature request: For questions like these you may talk to your SE to place feature requests.
Subject: Subnet wildcards in a security policy
FR ID: 1038
Hope this helps.
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