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Sophos UTM additional addresses.

Sophos User3655

Hi, Tony here (sorry the temporary maintenance seems to have created me a new user and not offering me a login!)

I am trying to add an additional IP range to my Sophos UTM. 9.413-4 (Virtual appliance)

I have 6 physical interfaces. 2 of them are external, the other 4 are for local subnets and a phone system.

As part of a comms migration 1 of the external interfaces is with our original provider, the other is patched directly to our new provider. We plan to move services to the new IP addresses by (changing the A record) and interface address in the UTM.

Our current providers external interface allows many different IP addresses to be used in the Webserver protection -> web application firewall.

Our new provider have provided a range of IP Addresses:

SUBNET - X.X.X.16/28
GATEWAY - X.X.X.17/28
USABLE - X.X.X.20 - X.X.X.30

I have setup the new interface with IP address X.X.X.20/28 and gateway of X.X.X.17

I have also added the additional IP's using: Interfaces->Additional Addresses  for X.X.X.20 - X.X.X.30 using /32 for each address setting the interface to match the new one. ( I have also tried using /28 with no change to the outcome)

On changing (the A Record to X.X.X.20) and changing the Webserver Protection -> Web Application Firewall -> Virtual Webserver -> (Intranet)  Interface to "NEWIP X.X.X.20"  I can access the site externally (it is using the new IP address I specified in the interface).

However - 

If I change the Virtual Webserver ->interface to "NEWIP X.X.X.24" ( One of the ADDITIONAL IP Addresses ) I cannot ping or access the site?

It appears none of the additional IP Addresses are responding. 

(IF I edit the new interface IP address to X.X.X.24 I can use that IP. Whatever single IP I specify in the interface works - It doesnt seen to detect and of the additional IP's)

The current provider IP range appears to be setup in the same way and works. I cannot see what rule or setting I have missed? why does traffic flow for the interface specified IP but not the additional IP Addresses?

Can anyone offer any help?

Many thanks,

Best regards,

Tony



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  • 0

    Hi Tony,
    really stupid questions ... i know ...
    Do you enable the additional addresses after defining them?
    Do you bind the additional addresses to the correct (new) interface?
    You are able to ping the additional IP from SG directly?

    I think there is no ISP-routing issue, because you are able to reach the IP if bound to the new interface directly.


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.

Reply
  • 0

    Hi Tony,
    really stupid questions ... i know ...
    Do you enable the additional addresses after defining them?
    Do you bind the additional addresses to the correct (new) interface?
    You are able to ping the additional IP from SG directly?

    I think there is no ISP-routing issue, because you are able to reach the IP if bound to the new interface directly.


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.

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