iproute uses too small of a receive buffer
It uses 1MB as receive buf limit by default (without
increasing /proc/sys/net/core/rmem_max it will be limited by less
however) and allows to specify the size manually using "-rcvbuf X"
(-r is already used, so you need to specify at least -rc).
Additionally rtnl_listen() continues on ENOBUFS after printing the
error message.
diff --git a/include/libnetlink.h b/include/libnetlink.h
index 0e02468..61da15b 100644
--- a/include/libnetlink.h
+++ b/include/libnetlink.h
@@ -17,6 +17,8 @@
__u32 dump;
};
+extern int rcvbuf;
+
extern int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions);
extern int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions, int protocol);
extern void rtnl_close(struct rtnl_handle *rth);