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Enhance --add-subnet to allow arbitary subnet addresses.

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Ed Bardsley
2015-08-05 21:17:18 +01:00
committed by Simon Kelley
parent d2aa7dfbb6
commit a7369bef8a
5 changed files with 121 additions and 26 deletions
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32
man/dnsmasq.8
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@@ -604,17 +604,27 @@ experimental. Also note that exposing MAC addresses in this way may
have security and privacy implications. The warning about caching
given for --add-subnet applies to --add-mac too.
.TP
.B --add-subnet[[=<IPv4 prefix length>],<IPv6 prefix length>]
Add the subnet address of the requestor to the DNS queries which are
forwarded upstream. The amount of the address forwarded depends on the
prefix length parameter: 32 (128 for IPv6) forwards the whole address,
zero forwards none of it but still marks the request so that no
upstream nameserver will add client address information either. The
default is zero for both IPv4 and IPv6. Note that upstream nameservers
may be configured to return different results based on this
information, but the dnsmasq cache does not take account. If a dnsmasq
instance is configured such that different results may be encountered,
caching should be disabled.
.B --add-subnet[[=[<IPv4 address>/]<IPv4 prefix length>][,[<IPv6 address>/]<IPv6 prefix length>]]
Add a subnet address to the DNS queries which are forwarded
upstream. If an address is specified in the flag, it will be used,
otherwise, the address of the requestor will be used. The amount of
the address forwarded depends on the prefix length parameter: 32 (128
for IPv6) forwards the whole address, zero forwards none of it but
still marks the request so that no upstream nameserver will add client
address information either. The default is zero for both IPv4 and
IPv6. Note that upstream nameservers may be configured to return
different results based on this information, but the dnsmasq cache
does not take account. If a dnsmasq instance is configured such that
different results may be encountered, caching should be disabled.
For example,
.B --add-subnet=24,96
will add the /24 and /96 subnets of the requestor for IPv4 and IPv6 requestors, respectively.
.B --add-subnet=1.2.3.4/24
will add 1.2.3.0/24 for IPv4 requestors and ::/0 for IPv6 requestors.
.B --add-subnet=1.2.3.4/24,1.2.3.4/24
will add 1.2.3.0/24 for both IPv4 and IPv6 requestors.
.TP
.B \-c, --cache-size=<cachesize>
Set the size of dnsmasq's cache. The default is 150 names. Setting the cache size to zero disables caching.