10-16-2007 10:22 PM - edited 03-11-2019 04:26 AM
Hello,
From which PIX OS version is it possible to assign a /31 address mask to an interface? In version 6.3(4) if I try to assign an IP with subnet mask 255.255.255.254 I get the error:
"Warning : IP and subnetmask form invalid pair indicating broadcast address"
I have seen a /31 mask assigned in PIX OS version 7.0 so I know it is possible. Anyone ever used one in version 6.XX ? I really need to use a /31 address because we have exhausted our company's public IPs.
10-17-2007 05:55 AM
I would have to think it is not available on the 6.x line of PIX OS due to the fact it wasn't available in the IOS version until 12.2(28)SB.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t2/ft31addr.htm
10-17-2007 06:28 AM
What address are you trying to enter?
10-18-2007 02:02 AM
Hello,
My addressing is:
xxx.xxx.xxx.228 255.255.255.254 Router
xxx.xxx.xxx.229 255.255.255.254 PIX
I am aware of the IOS feature being available from version 12.2 onwards. I just could not find any documentation about PIX OS. There is an indirect reference to this limitation in Management Center for Firewalls ver 1.3.2 (part of the CiscoWorks VPN suite):
However the documentation of Management Center for Firewalls itself states that it supports PIX OS versions up to 6.3.3:
http://www.cisco.com/univercd/cc/td/doc/product/rtrmgmt/cw2000/mgt_pix/fwmc_1_3/px_sd_13.htm#wp11866
So there is no definite answer about versions 6.3.4 and 6.3.5. I already verified that in version 6.3.4 /31 netmasks are not supported so my guess is that most probably they are not supported also in version 6.3.5
Thank you for your help, anyway.
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