On Thu, 14 Jul 2011 09:24:18 +0100, Simon Kelley <si...@thekelleys.org.uk> wrote: > Dnsmasq attempts to do that same thing, but the implementation is a bit > different. Instead of keeping records of all clients almost forever, it > allocates IP addresses using a hash of the client's MAC address, so > normally the same client should always get the same address. To make > this work well, the size of the DHCP address range should ideally be > much larger than the number of clients. If you have ten IP addresses and > nine clients, then hash collisions will mean that the IP address > allocations are essentially random. If you have 250 IP addresses and > nine clients, then there will probably be no collisions, and a client > will always get the same IP address. > > Another option to consider is to make DHCP lease times infinite, that > will give the same address every time, but might risk running out of > addresses long-term is the set of clients changes over time. > > Finally, if the only reason you care about long-term stable addresses is > for naming in /etc/hosts, then consider moving that information to the > dnsmasq configuration and mapping names to MAC addresses instead. > > dhcp-host=11:22:33:44:55:66,mylaptop > > that way stable IP addresses are not required. (See also --read-ethers), > you can keep this mapping in /etc/ethers rather than the dnsmasq > configuration file if that suits.)
Thank you for this. /etc/ethers and /etc/hosts is quite a nice solution. However, I do have one query regarding mapping multiple MACs/IP addresses to a single host. Several devices on my network have both wired and wireless adapters and it would be nice if both could share the same hostname; under the assumption that the two will never be connected at the same time. Is this possible with /etc/ethers? Regards, Freddie.
