<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Hi,<br>
<br>
I need the dnsmasq --dhcp-relay option, how do i add this option to
the dnsmasq script ?<br>
<br>
Perry<br>
<br>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
--dhcp-relay=<local address>,<server
address>[,<interface] Configure dnsmasq to do DHCP relay. The
local address is an address allocated to an interface on the host
running dnsmasq. All DHCP requests arriving on that interface will
we relayed to a remote DHCP server at the server address. It is
possible to relay from a single local address to multiple remote
servers by using multiple dhcp-relay configs with the same local
address and different server addresses. A server address must be an
IP literal address, not a domain name. In the case of DHCPv6, the
server address may be the ALL_SERVERS multicast address, ff05::1:3.
In this case the interface must be given, not be wildcard, and is
used to direct the multicast to the correct interface to reach the
DHCP server.<br>
<br>
Access control for DHCP clients has the same rules as for the DHCP
server, see --interface, --except-interface, etc. The optional
interface name in the dhcp-relay config has a different function: it
controls on which interface DHCP replies from the server will be
accepted. This is intended for configurations which have three
interfaces: one being relayed from, a second connecting the DHCP
server, and a third untrusted network, typically the wider internet.
It avoids the possibility of spoof replies arriving via this third
interface.<br>
<br>
It is allowed to have dnsmasq act as a DHCP server on one set of
interfaces and relay from a disjoint set of interfaces. Note that
whilst it is quite possible to write configurations which appear to
act as a server and a relay on the same interface, this is not
supported: the relay function will take precedence.<br>
<br>
Both DHCPv4 and DHCPv6 relay is supported. It's not possible to
relay DHCPv4 to a DHCPv6 server or vice-versa.<br>
</body>
</html>