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New Member

discontiguous netmask

can we use a discontiguous netmask on firewall say like 255.255.255.5

2 REPLIES
Cisco Employee

Re: discontiguous netmask

Apparently not:

SV2-21(config-if)# ip addr 192.168.13.2 255.255.255.5

ERROR: Bad mask 255.255.255.5 for address 192.168.13.2

SV2-21(config-if)# ip addr 192.168.13.20 255.255.255.5

ERROR: Bad mask 255.255.255.5 for address 192.168.13.20

SV2-21(config-if)# ip addr 192.168.13.21 255.255.255.5

ERROR: Bad mask 255.255.255.5 for address 192.168.13.21

SV2-21(config-if)# ip addr 192.168.13.6 255.255.255.5

ERROR: Bad mask 255.255.255.5 for address 192.168.13.6

SV2-21(config-if)# ip addr 192.168.13.7 255.255.255.5

ERROR: Bad mask 255.255.255.5 for address 192.168.13.7

SV2-21(config-if)# ip addr 192.168.13.8 255.255.255.5

ERROR: Bad mask 255.255.255.5 for address 192.168.13.8

SV2-21(config-if)# ip addr 192.168.13.9 255.255.255.5

ERROR: Bad mask 255.255.255.5 for address 192.168.13.9

SV2-21(config-if)# ip addr 192.168.13.10 255.255.255.5

ERROR: Bad mask 255.255.255.5 for address 192.168.13.10

SV2-21(config-if)# ip addr 192.168.13.111 255.255.255.5

ERROR: Bad mask 255.255.255.5 for address 192.168.13.111

SV2-21(config-if)# ip addr 192.168.13.11 255.255.255.5

ERROR: Bad mask 255.255.255.5 for address 192.168.13.11

SV2-21(config-if)# ip addr 192.168.13.12 255.255.255.5

ERROR: Bad mask 255.255.255.5 for address 192.168.13.12

SV2-21(config-if)# ip addr 192.168.13.13 255.255.255.5

ERROR: Bad mask 255.255.255.5 for address 192.168.13.13

SV2-21(config-if)#

This is in v7.0, it will certainly be the same for 7.1, and I never saw anything saying discontiguous masks were supported in 6.3 either. Even if you could configure it I would be wary of any issues with it because it's certainly not something we would test.

New Member

Re: discontiguous netmask

Sorry i forgot to mention that discontiguous mask in ACL of FW

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