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Re: IP Multiplex Limit

 
JLee_1
Advisor

IP Multiplex Limit

All,
Does anyone know what the limit is on IP Multiplexing? How many IP's can be assigned to one NIC?

Thanks in advance.
4 REPLIES 4
JLee_1
Advisor

Re: IP Multiplex Limit

Asked and answered. . .
256 is the limit of VIPs you can have on on NIC.

I give myself 10 points ;-)
rick jones
Honored Contributor

Re: IP Multiplex Limit

Where did you see the limit stated as 256? I was under the impression that for HP-UX 11.X anyway, there was no pre-set limit.
there is no rest for the wicked yet the virtuous have no pillows
Fermin Jamieson
Advisor

Re: IP Multiplex Limit

For a single network number, the limit is 253. Using the entire range..
dc-comic
rick jones
Honored Contributor

Re: IP Multiplex Limit

I believe you may be confusing how many host addresses can exist in a "Class-C" network with how many IP addresses can be assigned to a given network interface under HP-UX.

Indeed, a "Class-C" network has a single octet of host portion (ie the last 8 bytes) and two of those addresses (0 and 255) are reserved, leaving 254 possible IPs. The number is 256 times that for a "Class-B" and another 256 times that for a "Class-A" address.

Of course, IP addresses have been "classless" for years now, so the more general answer is there are (2^N)-2 host addresses available in a given subnet where N is the number of bits in the host portion of the address.

As one can assign IP addresses from multiple subnets to the same NIC under HP-UX, the "per-subnet" limit to the number of host addresses in an IP subnet is _not_ the limit to the number of IP's one can assign to a NIC.
there is no rest for the wicked yet the virtuous have no pillows