On 7/10/24 22:52, Sven Geuer wrote:
Hi Tim,
On Wed, 2024-07-10 at 21:55 +0200, Tim Tassonis wrote:
Hi all
I tried using dnsmasq as local resolver, which in general works fine.
However, I however would like to run a second instance of dnsmasq
binding only to a tap0, for a virtual network (vde2) for some qemu
virtual machines, and I can't seem to get that to work, as it always
complains about 127.0.0.1 already being taken.
I tried:
DHCP_OPT="192.168.8.9,192.1688.8.99,255.255.255.0,192.168.8.255,8h"
dnsmasq --log-queries --user=dnsmasq \
--dhcp-leasefile=/var/lib/misc/qemu-vde-dnsmasq.leases \
--dhcp-range=$DHCP_RANGE \
--listen-address=192.168.8.1 \
--interface=tap0 --except-interface=lo \
--domain=decentral.ch \
--enable-tftp \
--dhcp-boot=/var/lib/qemu-vde/pxeboot/pxelinux.0 \
--pid-file=/run/qemu-vde-dnsmasq.pid
This works fine, but only if the local dnsmasq is not started.
Otherwise, it will fail with:
dnsmasq: failed to create listening socket for 127.0.0.1: Address
already in use
Any ideas?
Looks like --bind-interfaces is missing from your configuration. I
would also recommend to drop --interface and --except-interface, and
only keep --listen-address.
Please re-read the manual page:
-i, --interface=<interface name>
Listen only on the specified interface(s). Dnsmasq automatically
adds the loopback (local) interface to the list of interfaces to use
when the --interface option is used. [...]
-a, --listen-address=<ipaddr>
Listen on the given IP address(es). Both --interface and --listen-
address options may be given, in which case the set of both
interfaces and addresses is used. Note that if no --interface option
is given, but --listen-address is, dnsmasq will not automatically
listen on the loopback interface. To achieve this, its IP address,
127.0.0.1, must be explicitly given as a --listen-address option.
-z, --bind-interfaces
On systems which support it, dnsmasq binds the wildcard address,
even when it is listening on only some interfaces. [...] Setting
this option also enables multiple instances of dnsmasq which provide
DHCP service to run in the same machine.
Hope this helps,
Yes, the --bind-interfaces did the trick, thank you very much!
Bye
Tim
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