It seems that you have found the very same issue I have already documented: http://hamradio.ucsd.edu/mailman/private/44net/2013-March/000848.html https://github.com/hessu/rip44d/issues/7 Unfortunately I haven't heard back from the author or someone else and I'm not a perl developer, so I cannot fix it myself. Best regards, Marc Quoting lleachii(a)aol.com: The populated route reads: 44.182.21.0 via 89.122.215.236 dev tunl0 onlink window 840 44.182.21.0 is a valid IP address on the ICANN Internet and does not imply a subnet in any form. It should contain a /24 notation as in the AMPRPortal: 44.182.21.0/24 via 89.122.215.236 dev tunl0 onlink window 840 No AMPR networks on my routing table (populated by RIP44d) contain the proper CIDR notations.