Trying to understand a design decision in RIPD. I originally reported this as a bug on quagga-users (https://lists.quagga.net/pipermail/quagga-users/2016-December/014604.html).
But in ripd.c, lines 1316 - 1323 I see the following:
/* Default route's netmask is ignored. */
if (packet->version == RIPv2
&& (rte->prefix.s_addr == 0)
&& (rte->mask.s_addr != 0))
{
if (IS_RIP_DEBUG_EVENT)
zlog_debug ("Default route with non-zero netmask. Set zero to
netmask");
rte->mask.s_addr = 0;
}
This code is preventing us distributing the route 0.0.0.0/1 through RIP and
retaining it's netmask. Would someone mind shedding some light on this code
& why the restriction exists?
FYI: Our motivation for distributing 0.0.0.0/1 is to cause LAN hosts to
prefer one ISP over another. If the preferred ISP goes down, a script we've
written will remove the static route (and remove it's companion route
128.0.0.0/1), which causes the LAN to use the backup ISP.
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