Is IP address ending in 0 valid?

zobo88

Can we assign a server interface the address of 10.x.x.0 ?
will it be valid and route able?

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Comments

dave330i

Depending on the subnet mask, yes.

zobo88

thanks
it is single address /32

Kelkin

Typically I would avoid the .0s because it can confuse people.. Especially those who are not Subnetting savvy.

NetworkVeteran

I use .0 frequently on point-to-point links, and all the major vendors support it just fine. I agree there's some potential for those less subnetting-savvy to make mistakes, but no more so than with IPv6 addresses when you go from ::9 to ::a.

sratakhin

NetworkVeteran, what subnet mask do you use with point-to-point links then?

P.S. Non subnetting-savvy people shouldn't configure network devices anyway

NetworkVeteran

sratakhin wrote: »

NetworkVeteran, what subnet mask do you use with point-to-point links then?

/31 for IPv4 and /127 for IPv6.

Kelkin

sratakhin wrote: »

NetworkVeteran, what subnet mask do you use with point-to-point links then?

P.S. Non subnetting-savvy people shouldn't configure network devices anyway

Shouldn't.. but often do..

DevilWAH

Kelkin wrote: »

Shouldn't.. but often do..

This is where you have user names and passwords to stop them doing these naughty things!!

dave330i

DevilWAH wrote: »

This is where you have user names and passwords to stop them doing these naughty things!!

user name: root
password: cisco

DevilWAH

dave330i wrote: »

user name: root
password: cisco

How did you know that??!! someone must have hacked my password DB..

sratakhin

It actually works

Backdoor password in Enterasys Vertical Horizon switches

CodeBlox

NetworkVeteran wrote: »

/31 for IPv4 and /127 for IPv6.

When in the world would someone use a /31? How does that work? The only addresses in that range ever would be your subnet ID and broadcast address. I consider myself extremely "subnet savvy" and I do not understand. Please explain!

EDIT: A quick google and it turns out that there is actually an RFC on this very thing... Huh, would've thought so! RFC 3021 - Using 31-Bit Prefixes on IPv4 Point-to-Point Links

DevilWAH

/32 and /31 are very common in the network world. loop back addresses and point to point routed links they make perfect sense. I would say after /16 and /24 masks they are possible the most common ones I use.

sratakhin

I always used /30. I guess it's time to learn something new.

CodeBlox

That's why I'm a member of these forums. I learn new stuff all the time here! That RFC was one of the shorter ones and easy to read.

NetworkVeteran

Heh. Glad you figured it out. It's a handy trick to know.

VAHokie56

I have seen /31 used in a great many of campus LANS, have yet to see it from a provider over the WAN though