Seems to work fine with version 2.57.  I have my laptop mapped wifi MAC and lan 
MAC both mapped to the same IP address, and it is working as expected.   The 
only thing is it is mapped in the dnsmasq.conf file, not the ethers file.  e.g.

dhcp-host=00:24:D7:2C:C9:14,F0:DE:F1:05:85:79,172.31.253.220,1440m

Regards,

Bill


On 03/22/2011 03:18 PM, Butrus Damaskus wrote:
Hello!

Is it possible to completely switch off the checks in dnsmasq and let
it serve identical IP adress(es) for multiple MAC addresses (even at
the same time - when the first lease is yet active)? I need it for
handover (of Laptops) between LAN and WiFi, so that the TCP
connections don't get broken when moving LAN ->  WiFi or vice versa.
(Both MAC addresses are on a bridged LAN/WiFi segment and the handover
works wonderfull if I set static IP for the LAN and serve the same IP
over WiFi from DHCP/dnsmasq. But I'd like not to have to configure the
clients manually...)

I use version 2.55 (OpenWrt / Backfire), tried to set "option no_ping
1" and "option rebind_protection 0" in the section "config dnsmasq" of
the /etc/config/dhcp (but cannot find any reasonable documentation for
this config file, don't know how much standard this config file is;
/etc/dnsmasq.conf doesn't seem to change anything anyway).
However it seems that dnsmasq would even not read the appropriate
IP/MAC pairs from /etc/ethers:

Mar 22 18:53:28 ********* daemon.info dnsmasq[2322]: read /etc/hosts -
16 addresses
Mar 22 18:53:28 ********* daemon.err dnsmasq-dhcp[2322]: ignoring
/etc/ethers line 12, duplicate name or IP address

So my question is: is this somehow possible? And: can this be done with OpenWrt?

Thanks!

Peter

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