Configuring a NET/ROM interface for TCP/IP

Linux Amateur Radio AX.25 HOWTO
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# 9. Configuring a NET/ROM interface for TCP/IP

Configuring a NET/ROM interface for TCP/IP is almost identical to configuring an AX.25 interface for TCP/IP.

Again you can either specify the ip address and mtu on the nrattach command line, or use the ifconfig and route commands, but you need to manually add arp entries for hosts you wish to route to because there is no mechanism available for your machine to learn what NET/ROM address it should use to reach a particular IP host.

So, to create an `nr0` device with an IP address of `44.136.8.5`, an mtu of `512` and configured with the details from the `/etc/ax25/nrports` file for a NET/ROM port named `netrom` you would use:

    # /usr/sbin/nrattach -i 44.136.8.5 -m 512 netrom
    # route add 44.136.8.5 nr0

or you could use something like the following commands manually:

    # /usr/sbin/nrattach netrom
    # ifconfig nr0 44.136.8.5 netmask 255.255.255.0 hw netrom VK2KTJ-9
    # route add 44.136.8.5 nr0

Then for each IP host you wish to reach via NET/ROM you need to set route and arp entries. To reach a destination host with an IP address of `44.136.80.4` at NET/ROM address `BBS:VK3BBS` via a NET/ROM neighbour with callsign `VK2SUT-0` you would use commands as follows:

    # route add 44.136.80.4 nr0
    # arp -t netrom -s 44.136.80.4 vk2sut-0
    # nrparms -nodes vk3bbs + BBS 120 6 sl0 vk2sut-0

The ``120`' and ``6`' arguments to the nrparms command are the NET/ROM quality and obsolescence count values for the route.

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Configuring a NET/ROM port |  | Configuring a ROSE port