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Add --shared-network DHCP configuration.

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Simon Kelley
2019-03-27 22:33:28 +00:00
parent 305ffb5ef0
commit ae5b7e04a1
8 changed files with 333 additions and 135 deletions
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21
man/dnsmasq.8
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@@ -1740,6 +1740,27 @@ wildcard can be used in each <alias>.
It is permissible to add more than one alias using more than one \fB--bridge-interface\fP option since
\fB--bridge-interface=int1,alias1,alias2\fP is exactly equivalent to
\fB--bridge-interface=int1,alias1 --bridge-interface=int1,alias2\fP
.TP
.B --shared-network=<interface>|<addr>,<addr>
The DHCP server determines which dhcp ranges are useable for allocating and
address to a DHCP client based on the network from which the DHCP request arrives,
and the IP configuration of the server's interface on that network. The shared-network
option extends the available subnets (and therefore dhcp ranges) beyond the
subnets configured on the arrival interface. The first argument is either the
name of an interface or an address which is configured on a local interface, and the
second argument is an address which defines another subnet on which addresses can be allocated.
To be useful, there must be suitable dhcp-range which allows address allocation on this subnet
and this dhcp-range MUST include the netmask. Use shared-network also needs extra
consideration of routing. Dnsmasq doesn't have the usual information which it uses to
determine the default route, so the default route option (or other routing) MUST be
manually configured. The client must have a route to the server: if the two-address form
of shared-network is used, this will be to the first specified address. If the interface,address
form is used, there must be a route to all of the addresses configured on the interface.
The two-address form of shared-network is also usable with a DHCP relay: the first address
is the address of the relay and the second, as before, specifies an extra subnet which
may be allocated.
.TP
.B \-s, --domain=<domain>[,<address range>[,local]]
Specifies DNS domains for the DHCP server. Domains may be be given