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A customer has provided an address of 105.193.211.255 to assign as the IP of a PAS. I am aware that in some instances this is not possible, as x.x.x.255 can be reserved as a broadcast address.
For example, 105.193.211.0/255.255.255.0
The network identifier would be 105.193.211.0
The broadcast address would be 105.193.211.255
Valid (or usable) ip addresses would be 105.193.211.1 to 105.193.211.254
However in an expanded network (Class A/B), I was under the assumption that this should be possible.
For example, 105.193.211.0/255.255.0.0
The network identifier would be 105.193.0.0
The broadcast address would be 105.193.255.255
Valid (or usable) ip addresses would be 105.193.0.1 to 105.193.255.254
When I am testing this on a PAS, it fails to save an IPV4 address ending in .255 regardless of the subnet. Am I missing something obvious? Or misunderstanding the capabilities here? Thanks.
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Hello,
As you mentioned, an all IPV4@ ended terminated by 255- in a /16 or larger subnet should not be prohibited .
But today the control of the value entered is simplified and all IP@ ending in 255 are prohibited regardless of the value of the mask.
The workaround today is to set another IP@ not terminated with 255. This should be possible due to the larger number of IP@s available in a class A/B subnet.
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I am no PAS expert, but I suspect 255 is reserved for historical reason https://www.se.com/us/en/faqs/FA222364/
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IP Address: 105.193.0.0/16
Network Address: 105.193.0.0
Usable Host IP Range: 105.193.0.1 - 105.193.255.254
Broadcast Address: 105.193.255.255
Total Number of Hosts: 65,536
Number of Usable Hosts: 65,534
Subnet Mask: 255.255.0.0
In theory, the PAS should be able to recognise /16 and allow IP assignment within any of the Usable Host IP range as above.. however seem like any IP ending with .255 is given this error.
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hello,
This is what I remember 0 is the network address and 255 is the brodcast address if you have /24 subnet.
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Hello,
As you mentioned, an all IPV4@ ended terminated by 255- in a /16 or larger subnet should not be prohibited .
But today the control of the value entered is simplified and all IP@ ending in 255 are prohibited regardless of the value of the mask.
The workaround today is to set another IP@ not terminated with 255. This should be possible due to the larger number of IP@s available in a class A/B subnet.
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Thanks for the response. This is what I was expecting.
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