from RIP' gateway list. Only applicable for RIP sourced
routes and if RIP is included as a route source. This octet
string contains the addresses of one or more routers that could
send RIP updates to this router. If a router address is
included in this list, this filter applies to RIP
advertisements from that router.
If non-null, The octet string contains one or more 4-octet
IP addresses. If null, this filter applies to RIP updates
from any router.