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Beginner

Firepower FTD 2110 /31 IP

Hi There,

We have just purchased a 2110 and were in the process of setting it up and have hit an early road block. Our ISP is using a /31 subnet for our internet link and it seems FMC will not support this when configuring the interface.

Is there any work arounds for this or do we need to go back to our ISP and change to a /30 IP range. We would rather not have to do this as we use this IP for many cloud services etc.

Looking forward to some advice.

Thanks

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Accepted Solutions
Hall of Fame Master

Re: Firepower FTD 2110 /31 IP

/31 addresses are not currently supported on FTD. Another customer reported the same thing a couple of months back and Cisco TAC confirmed the support was not currently there on 6.2.3:

https://community.cisco.com/t5/firewalls/ftd-6-2-3-on-asa5506-x-unable-to-use-31-mask-on-ipv4-data/td-p/3866229

It wasn't changed in 6.3 or 6.4.

I don't have any word as to whether this will change with any upcoming releases.

2 REPLIES 2
Hall of Fame Master

Re: Firepower FTD 2110 /31 IP

/31 addresses are not currently supported on FTD. Another customer reported the same thing a couple of months back and Cisco TAC confirmed the support was not currently there on 6.2.3:

https://community.cisco.com/t5/firewalls/ftd-6-2-3-on-asa5506-x-unable-to-use-31-mask-on-ipv4-data/td-p/3866229

It wasn't changed in 6.3 or 6.4.

I don't have any word as to whether this will change with any upcoming releases.

Highlighted
Beginner

Re: Firepower FTD 2110 /31 IP

Thanks @Marvin Rhoads Appreciate that. Will need to get the ISP to change the IP to a /30.