On 25/12/10 10:48, Jan Engelhardt wrote:
On Friday 2010-12-24 16:32, Stephen Clark wrote:
Because -d takes a prefix and --to-source takes an address range.
So? you can't parse
205.201.149.214/32-205.201.149.218/32
a.b.c.d/32 is a prefix notation, even though it represents a single
address. IMO it does not make sense to use a prefix notation in an
interval, so I don't see why the parser should handle it. AFAICS, other
commands such as 'ip' from iproute don't accept /32 prefixes where a
single address is expected either.
Well It is just one more idiosyncrasy one has to remember, when to me there
is no obvious reason
Historical reasons.
Possible extra explanations:
- DNAT was added later than the -s argument, and someone thought
it's better to use a range, since a range can be more expressive
than addr[/prefixlen] for the same memory usage.
- On the other hand, since iptables also accepts addr[/mask], and it
also allows /masks that are not representable as a /prefixlen, it
is not necessarily specifying a contiguous range which may be
useless to use with DNAT to some.
FWIW: we (Squid project) use the syntax "ip[-ip][/mask]". This is simple
enough to parse and is a bit more flexible.
/2c
AYJ
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