Hi Tom, list members,

Shorewall has NULL_ROUTE_RFC1918. I'd like to propose another one:
NULL_ROUTE_RFC5737. This RFC describes the address ranges that are
reserved for documentation.

Quoting from https://tools.ietf.org/html/rfc5737:

"The blocks 192.0.2.0/24 (TEST-NET-1), 198.51.100.0/24 (TEST-NET-2),
and 203.0.113.0/24 (TEST-NET-3) are provided for use in documentation."

I'm currently blocking these by simply adding these ranges to
/etc/shorewall/routes. But it would be nice to set it in shorewall.conf
because this will give (blocking) these particular subnets a bit more
attention.


And while on the topic; perhaps for IPv6/shorewall6 there can be a
NULL_ROUTE_RFC4193 and NULL_ROUTE_RFC3849 that would null-route
respectively the fc00::/7 range which is reserved for Unique Local IPv6
Unicast Addresses, and the 2001:DB8::/32 range which is reserved for
documentation.

https://tools.ietf.org/html/rfc4193
https://tools.ietf.org/html/rfc3849

This would be convenient and someone who would use these ranges either
with IPv4 and/or with IPv6 could set ROUTE_FILTER=Yes.

What do you think? :)

Thanks,
Mark

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