On 13.02.22 17:20, Chris Green wrote:
I want to configure a system to listen on an address that it doesn't
actually have until I add the address to the network interface.
https://duckduckgo.com/?q=linux+bind+foreign+IP&t=seamonkey&ia=web
on linux you should set net.ipv4.ip_nonlocal_bind=1
Feb 13 16:56:27 esprimo systemd[1]: Starting dnsmasq - A lightweight DHCP
and caching DNS server...
Feb 13 16:56:27 esprimo dnsmasq[3847]: dnsmasq: failed to create listening
socket for 192.168.1.2: Cannot assign requested address
Feb 13 16:56:27 esprimo dnsmasq[3847]: failed to create listening socket for
192.168.1.2: Cannot assign requested address
Feb 13 16:56:27 esprimo dnsmasq[3847]: FAILED to start up
Feb 13 16:56:27 esprimo systemd[1]: dnsmasq.service: Control process exited,
code=exited, status=2/INVALIDARGUMENT
Feb 13 16:56:27 esprimo systemd[1]: dnsmasq.service: Failed with result
'exit-code'.
Feb 13 16:56:27 esprimo systemd[1]: Failed to start dnsmasq - A lightweight
DHCP and caching DNS server.
In the dnsmasq man page it has:-
-z, --bind-interfaces
On systems which support it, dnsmasq binds the wildcard address,
even when it
is listening on only some interfaces. It then discards requests
that it
shouldn't reply to. This has the advantage of working even when
interfaces come
and go and change address. This option forces dnsmasq to really bind
only the
interfaces it is listening on. About the only time when this is
useful is when
running another nameserver (or another instance of dnsmasq) on the
same ma‐
chine. Setting this option also enables multiple instances of
dnsmasq which
provide DHCP service to run in the same machine.
I thought this would mean I could do what I want which is to have:-
listen-address=192.168.1.2,127.0.0.1
... and only actually create the IP 192.168.1.2 on the network interface
when I want this system to be the DHCP/DNS server.
no, this affects how dnsmasq calls bind(), not how bind() will respond.
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