[Xorp-users] XORP config - why 127.127.0.1

[Mike Horn]

Hi Dave,

On the XORP system, the traditional loopback 127.0.0.1 is used by the XRL IPC process, so you need to be very careful when configuring things like interface IP addresses, firewall rules, etc. that might affect this communications path.  For instance, creating a discard interface with the 127.0.0.1 IP address could cause rtrmgr to stop communicating with the other processes, which would be fatal (hence the use of a different IP address in the example).

In order to avoid confusion the sample configuration should probably be updated with a different IP address.

-mike

----- Original Message -----
From: Dave Price <dave.price@aber.ac.uk>
To: xorp-users@xorp.org
Cc: dap@aber.ac.uk
Sent: Monday, March 13, 2006 3:07:11 AM GMT-0700
Subject: [Xorp-users] XORP config - why 127.127.0.1

Dear All,

The sample config.boot given out with Xorp 1.2RC
contains...

    interface discard0 {
        description: "discard interface"
        disable: false
        discard: true
        vif discard0 {
            disable: false
            address 127.127.0.1 {
                prefix-length: 32
                disable: false
            }
        }
    }

Can some explain the logic behind why this particular address
is chosen.  I'm  quite used to the fact that 127.0.0.1
refers to localhost of course, but I'd not picked
up on signficance of 127.127.0.1

Thanks,

Dave Price

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