[44net] Trouble setting up a gateway via IPIP tunnel

Hey y'all. I'm having difficulty setting up my gateway using IPIP. I followed all instructions to set up a gateway, but the Linux hardware I'm using as a gateway is stuck on "Waiting for RIPv2 broadcasts" for a very long time and is not progressing. I'm not sure if it's something I did wrong or if I'm forgetting something or if it's some other issue that's beyond my control. Can someone please shed some light on what might cause it to hang and not progress any further?