Hi..
I was going through some subnetting scenarios and came across this stuf
which is confusing for me.We have been given a network range of
10.60.0.0/24.
We have 3 routers which are connected back to back and they all have 3
ethernet ports for 3 ethernet networks.Each subnet will have max. hos
- You can use all 4 subnets on your example of 10.60.0.0/24 range.
There are times when you need the "ip subnet-zero" command. In your case
you should not
need. If you you had chosen the range 10.0.0.0 /24, then the command ip
subnet-zero
command would be relevant.
- You should not use 10.60.0.
Answering early to increase the chance of humiliation if I make mistakes
In this case, the 1st and 4th octets are not subnets of all zero's/all
one's, because you are using a Class A address. Your 4 little 26 bit subnets
are right in the middle(ish) of a very large Class A network (10.0.0.0 -
Good.. but you can't have a subnet with 31 bits that would leave 2
"hosts" and the network address and the broadcast would use them up, so you
end up with 0 hosts per subnet. For point-to-point serial links, you'd
usually use a /30 (255.255.255.252) which gives you 4 addresses per subnet
Currently you can't use /31 networks. However, there is an RFC that
proposes changes that would allow their use on point-to-point links only.
RFC 3021 Using 31-Bit Prefixes on IPv4 Point-to-Point Links. A. Retana,
R. White, V. Fuller, D. McPherson. December 2000. (Format: TXT=19771
bytes) (Sta
>Good.. but you can't have a subnet with 31 bits that would leave 2
>"hosts" and the network address and the broadcast would use them up, so you
>end up with 0 hosts per subnet. For point-to-point serial links, you'd
>usually use a /30 (255.255.255.252) which gives you 4 addresses per sub
y, October 31, 2001 2:03 PM
Subject: Re: IP addressing Subnetting [7:24712]
> Currently you can't use /31 networks. However, there is an RFC that
> proposes changes that would allow their use on point-to-point links only.
>
> RFC 3021 Using 31-Bit Prefixes on IPv4 Point-to-Point L
why would this be needed?
30 bits works perfect for serial links... Am I missing something?
>>> "Karen Young" 10/31/01 02:03PM >>>
Currently you can't use /31 networks. However, there is an RFC that
proposes changes that would allow their use on point-to-point links only.
RFC 3021 Using 31-B
Who needs to worry about subnetting with the one day exam? (disclaimer: this
is only a joke, no flames please)
-Original Message-
From: Howard C. Berkowitz [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, October 31, 2001 12:19 PM
To: [EMAIL PROTECTED]
Subject: Re: IP addressing Subnetting
On Mar 23, 8:54am, "Howard C. Berkowitz" wrote:
}
} >Good.. but you can't have a subnet with 31 bits that would leave 2
} >"hosts" and the network address and the broadcast would use them up, so
you
} >end up with 0 hosts per subnet. For point-to-point serial links, you'd
} >usually use
>why would this be needed?
>
>30 bits works perfect for serial links... Am I missing something?\
It wastes two bits with every subnet. IPv4 address space is not an
infinite resource.
>
"Karen Young" 10/31/01 02:03PM >>>
>Currently you can't use /31 networks. However, there is an RFC tha
/31 support is in 12.2(2)T for most platforms. I tried
it on serials and it works fine. Haven't tried it on
LAN interfaces yet, but don't see why it wouldn't
work.
--- "[EMAIL PROTECTED] (John Nemeth)"
wrote:
> On Mar 23, 8:54am, "Howard C. Berkowitz" wrote:
> }
> } >Good.. but you can't h
On Mar 23, 6:42pm, "Erick B." wrote:
}
} /31 support is in 12.2(2)T for most platforms. I tried
} it on serials and it works fine. Haven't tried it on
} LAN interfaces yet, but don't see why it wouldn't
} work.
I have a 2502 in my lab, running:
IOS (tm) 2500 Software (C2500-JK8OS-L), Vers
Yes you can, 12.2.4T
1750># interface Loopback9
1750># ip address 111.11.1.1 255.255.255.254
Dave
Karen Young wrote:
>
> Currently you can't use /31 networks. However, there is an RFC that
> proposes changes that would allow their use on point-to-point links only.
>
> RFC 3021 Using 31-Bit
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