invalid ip and subnet combination

  • Thread starter Thread starter Deepak Singh
  • Start date Start date
D

Deepak Singh

I am trying to intstall a DIAS (DSL) connection
I have connected the modem to my telephone line and the
modem is in sync.

i cant put the following info in the lan card settings
though -

IP - 10.1.12.1
subnet - 255.255.255.254
Gateway - 10.1.12.1
DNS - 61.0.96.33
61.0.0.5
When i give this information in the lan card settings i
receive following error :-

The combination of IP address and Subnet mask is invalid.
All of the bits in the host address portion of the IP
address are set to 1. Please enter a valid combination of
IP address and Subnet mask.

I have been told that the above information works
perfectly in Windows Me or 98 but I have only Win XP
installed on my system. Please help me.
 
"The combination of ip address and subnet mask is invalid. All of the bits in the host address portion of the IP address are set to 1"

linux can set public ip adress with netmask 255.255.255.255 - so why winxp can not ?

but ... I could accept that it can not accept 255.255.255.255 (/32) netmask ...

but why doesn't it work for /31 (all bits except the topmost are set to 1). it *SHOULD* work
with netmask 255.255.255.254 (254 = 128+64+32+16+8+4+2)


so, I think that perhaps this is a *BUG* found in windows XP, windows 2000...

I have found _no_ reference to this behaviour anywhere. In fact, nobody on the internet stumbled on this problem (yet ?).


In my case, I have a ubuntu-linux router with public ip, and a NAT with 3 computers on 10.1.0.0/16 network.

Since I can use 5 public ip adresses (as ISP assigned them to me), I wanted to configure my windows to have public internet IP address.

(and that assumes 255.255.255.255 netmask)
when you dial-up to the internet via modem, ppp protocol assigns you public internet address and netmask 255.255.255.255 (as it should) ...

I don't see any reason why my lan card can not have IP of (for example) 82.32.54.31 and netmask 255.255.255.255.

Perhaps microsoft intentionally wanted to prevent assignment of public ip adresses to lan adapters (in order to sell win2k servers, domain controllers and ... ??)
 
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