RFC1918

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RFC1918

L4 Transporter

Basic trust to untrust policy I see internal address sending snmp to addresses like 10.0.0.1, 192.168.1.x.

 

Do people create a policy to block internal traffic going to RFC1918 on the untrusted interface?

3 REPLIES 3

L7 Applicator

I usually block trust to untrust RFC1918.

Although ISP routers drop it anyway I like to keep it clean.

It is really common for many applications like Skype for example to scan internal ranges for peers.

Enterprise Architect, Security @ Cloud Carib Ltd
ACE, PCNSE, PCNSI

L0 Member

Do you have the one line policy.

 

Trust to untrust  ( the builtin PAN addresses appear confusing.

 

TrRUST or INSIDE zones

ANY

UNTRUST  

  • 10.0.0.0  10.255.255.255  (10/8 prefix)
  • 172.16.0.0  172.31.255.255  (172.16/12 prefix)
  • 192.168.0.0  192.168.255.255 (192.168/16 prefix)

Action Block/deny

This is  the first policy I believe

Cyber Elite
Cyber Elite

Hello,

If you follow a DENY ALL allow by exception methodology, just put a DENY ALL policy at the bottom of the Security Policies. This way only traffic that you 'allow' is allowed to go between zones, etc.

 

Regards,

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