What's the difference?
There is a big difference in how the packets are processed.
The regular RIPv2 sets a route to a specific subnet via the sender and interface where the RIP broadcast was received on. The gateway information is used only as an optimization element, in case a route with to that gateway already exists so that the one with the lower metric gets chosen.
In our case, we use the RIP announcements to transport the subnet AND gateway information.
So, assuming a point to multipoint interface, if there is let's say an announcement 126.96.36.199/24 via 188.8.131.52 coming from 184.108.40.206 on the ipip0 interface, regular RIPv2 would translate this to:
220.127.116.11/24 via 18.104.22.168 if ipip0
while ampr rip would translate this to:
22.214.171.124/24 via 126.96.36.199 if ipip0
In the first case, traffic to 188.8.131.52/24 is sent directly to the gateway (the RIP sender), while in the second case it is encapsulated to 184.108.40.206.
On a mikrotik router it even goes a step further: it creates a ipip tunnel interface, ampr-220.127.116.11 to 18.104.22.168 and creates a route
22.214.171.124/24 via ampr-126.96.36.199
This is the processing in the usual case, for 44 subnets having a 44net gateway we assume that the gateway is published by BGP and is directly reachable, so for a announcement like 188.8.131.52/24 via 184.108.40.206 there are 2 route set:
220.127.116.11 via default-gw (which is autodetected), and 18.104.22.168/24 via 22.214.171.124 if ipip0 to do the encapsulation
So, while the information structure in both cases conforms to the RIPv2 specifications, its usage is completely different.
Two programs are available for GNU/Linux to utilize these updates:
The RIP44 daemons have been tested and known to work on the following operating systems:
- Slackware Linux
- Ubuntu/Debian Linux
The devices below do not possess a known, end-user method to install additional software (i.e. ampr-ripd). Operators have developed scripts to parse inbound routing packets to make them compatible for usage on AMPRNet:
- Cisco IOS (a separate machine must run the script) : look here http://wiki.ampr.org/wiki/Setting_up_a_gateway_on_Cisco_Routers at the "Making the route commands automatically" section
- MikroTik : look here http://www.yo2loj.ro/hamprojects/ at the "Mikrotik RIPv2 AMPR Gateway Setup Script 3.0"
- Ubiquiti OS