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Home » Kerio User Forums » Kerio Operator » Couldn't set /31 mask (netmask 255.255.255.254)
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po3dno

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I couldn't set /31 mask for network card.
x.x.x.16/255.255.255.254
gateway is x.x.x.17

KOP say me: "The IP address is illegal for the given mask!"

What should I do?
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Petr Dobry (Kerio)

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IP subnet with 2 IP addresses actually has /30 netmask (255.255.255.252).

/31 netmask is invalid.

Petr Dobry
Product Development Manager | Kerio
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po3dno

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Petr Dobry (Kerio) wrote on Mon, 23 May 2011 12:59
IP subnet with 2 IP addresses actually has /30 netmask (255.255.255.252).

/31 netmask is invalid.



Please read: RFC 3021 - Using 31-Bit Prefixes on IPv4 Point-to-Point Links
www.faqs.org/rfcs/rfc3021.html
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po3dno

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For example (for Linux):
ifconfig 192.168.42.0 -broadcast pointopoint 192.168.42.1
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Vladimir Toncar (Kerio)

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Hi,

Can RFC3021 be applied to Ethernet?

Vladimir
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