Sorry, forgot to mention the dnsmasq version is 2.73 (dnsmasq-full 2.73-1) on OpenWrt Chaos Calmer 15.05. Let me know if I can provide other useful information.
Regards, Timo Timo Sigurdsson schrieb am 11.01.2016 15:44: > Hi, > > I'm using dnsmasq on OpenWrt as my DHCP and DNS server for my home network. I > set > up static leases for all my clients which mostly works well, but sometimes > dnsmasq fails to offer the static IPv4 lease to some of my clients. Instead, > they > will get a dynamic IP. Now this doesn't happen too often (sometimes it works > for > 2 weeks without any issue), but it does happen occasionally (sometimes even > with 2 clients on the > same day). > > Some basic information: > - I first used the OpenWrt configuration interface UCI to set up the static > leases. But after I became aware of the occasional dynamic assignments, I > switched to configuring the static leases via /etc/hosts and /etc/ethers > instead. > But that didn't solve it. > > - I have a total of 16 static leases defined which covers all my network > devices. > I only use static leases for IPv4. The IP range dnsmasq can use is big enough > (100 addresses) and all static leases are within that range, of course. > > - The clients with which I saw this problem don't have much in common. One is > a > wired desktop computer running Windows 7. The other is a wireless MacBook Air > running OS X. The only similarity I find is that these are both clients that > are > not running 24/7. They are often shut down and also often go to standby and > wake > up from it. I have two servers on the network that are always connected and > with > them I haven't observed any false IP assignment yet. > > - All clients have only one way to connect to the network. So, there are no > laptops that would sometimes connect wireless and sometimes wired or anything > like that. > > - I tried different lease times from 2h to 12h with no effect so far. > > - Before I started using OpenWrt with dnsmasq, I used a Linksys Router with > the > proprietary vendor firmware and had set up the same static leases there, too. > I > never observed such an issue with any of these (same) clients, so it shouldn't > be caused by the clients themselves. > > When a client does not receive the correct static lease, I can see in the logs > that dnsmasq doesn't send a DHCPOFFER after a DHCPDISCOVER. But I don't see > why. > I can see, though, that when a client gets a dynamic IP instead of a static > one, > dnsmasq refuses to assign the local domain name (hostname.lan) to this client > that is listed in /etc/hosts. So, dnsmasq seems to recognize the client after > all, but fails to offer the static lease. Since I have only seem this problem > so > far with clients that often disconnect and reconnect or go to standby and wake > up > again, I just assume that it might have to do something with DHCP leases that > haven't expired yet. That's why I tried diffent lease times but so far with no > luck. Another thing I noticed is: When a client get's a dynamic lease and asks > for renewal of the lease at some point, dnsmasq will just acknowledge this > request rather than assigning the static lease to the client. So unless I > force > the client to reconnect (and sometimes reboot the router), they will just keep > using the dynamic lease. > > What ca I do to prevent this from happening? How can I ensure clients will be > served the correct static lease? > In addition, what is a good or recommended lease time for a home network where > clients should keep the same IP address and where there is a mix of wired and > wireless clients? > > I had asked this on the OpenWrt forums before, but nobody was able to help me > there. So, I'd really appreciate any insights or hints you might have. Thanks. > > Regards, > > Timo > > > _______________________________________________ > Dnsmasq-discuss mailing list > [email protected] > http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss > _______________________________________________ Dnsmasq-discuss mailing list [email protected] http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
