Re: Dnsmasq instead of dhcp3/tftpd-hpa and other ideas

> 1) Recommend: dnsmasq instead of isc-dhcp-server/tftpd-hpa.

vmlintu in #ltsp mentioned a significant problem that dnsmasq has as a 
DHCP server. Its DHCP code is not reentrant, so it has to wait for 2-3 
seconds for the reply of each "addr-in-use" ping it does before 
assigning DHCP leases, and that's disastrous for medium or large 
installations.
One could work around it with a very big lease time and with the 
--no-ping option, but it's not something we'd want to propose as the 
LTSP default.
More info on the dnsmasq-discuss ML thread I started:
http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2012q2/005767.html

Of course the proxy DHCP mode of dnsmasq doesn't suffer from that 
problem, so an ltsp-server-dnsmasq package would be much appreciated by 
people using single-NIC setups, with external DHCP servers (routers...).

Btw I also filed a feature request for tftpd-hpa to allow following 
symlinks outside the TFTP dir:
http://www.syslinux.org/archives/2012-April/017489.html

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