[Dnsmasq-discuss] Stateful DHCP and DNS for both IPv4 and IPv6

Cyberfusion wedwards at cyberfusion.nl
Sat Apr 3 10:39:51 UTC 2021


> Op 3 apr. 2021 om 12:10 heeft Guillermo López Alejos via Dnsmasq-discuss <dnsmasq-discuss at lists.thekelleys.org.uk> het volgende geschreven:
> 
> Hi!,
> 
> I'm working on a dockerized deployment of dnsmasq for my local network (the base image is Debian 10.8-slim). My goal is to achieve stateful DHCP and DNS for both IPv4 and IPv6.
> 
> At this point IPv4 DHCP and DNS is working fine, and I'm getting some IPv6 DNS resolution for static entries in the "/etc/hosts" file. I'm, however, struggling with IPv6 DNS resolution. At the end of the message are the involved configuration files, and a sample of the logs produced by dnsmasq (I'm omitting Docker-related files since I believe that it is safe to assume that that configuration is correct). dnsmasq is running in the domctr.ewlan.es host.
> 
> If I do "ping -6 domctr" from another host, then I get a reply from the "domctr" server (this is the only host with an IPv6 address in the /etc/hosts file). For any other host I get an "No address associated with hostname" error. dnsmasq logs seem healthy.
> 
> This is almost the first time I deal with dnsmasq and IPv6, and I'm discovering that IPv6 concepts go far beyond the IPv4 concepts I'm used to... Perhaps I should start there...

IPv6 is only the protocol of the future... :)

> 
> Any help would be very much appreciated.
> 
> Thanks in advance,
> 
> Guillermo
> 
> 
> ---- /etc/network/interfaces (Docker host) ------------------------------------
> 
> # The loopback network interface
> auto lo
> iface lo inet loopback
> 
> allow-hotplug eth0
> iface eth0 inet static
>     address 192.168.1.4
>     netmask 255.255.255.0
>     broadcast 192.168.1.255
>     gateway 192.168.1.1
> 
> ---- /etc/hosts (Docker container) --------------------------------------------
> 
> 192.168.1.2            ewnas.ewlan.es     ewnas
> 192.168.1.3            mykvm.ewlan.es        mykvm
> 192.168.1.4            domctr.ewlan.es        domctr
> fe80::5054:ff:fe13:29e6        domctr.ewlan.es        domctr
> 
> ---- dnsmasq.conf (Docker container) ------------------------------------------
> 
> # Don't use and don't poll /etc/resolv.conf or other resolv files for changes.
> no-resolv
> no-poll
> 
> # Name servers to use
> server=62.14.2.1
> server=62.14.63.145
> 
> # Set the dnsmasq domain
> domain=ewlan.es
> 
> # Local domains. Queries in these domains are answered from /etc/hosts or DHCP
> # only
> local=/ewlan.es/
> 
> # Only listen for DHCP and DNS requests on the following interfaces
> interface=eth0
> 
> # Define the DHCP range with the following format:
> # <start IP address>,<end IP address>,[lease time]
> dhcp-range=192.168.1.200,192.168.1.250,12h
> dhcp-range=::fe13:1,::fe13:ffff,constructor:eth0,ra-names,slaac,12h
> 
> # Enable dnsmasq's IPv6 Router Advertisement feature.
> enable-ra
> 
> # Mark created RA with high priority and specify 0 for router lifetime
> # to specify the Dnsmasq address should not be used as a gateway
> ra-param=eth0,high,0,0
> 
> # Set the gateway
> dhcp-option=option:router,192.168.1.1
> 
> # Set the ntp server
> dhcp-option=option:ntp-server,192.168.1.4
> # Use 'ip address' command to determine the IPv6 address of the interface.
> dhcp-option=option6:dns-server,[fe80::5054:ff:fe13:29e6]
> dhcp-option=option6:ntp-server,[fe80::5054:ff:fe13:29e6]
> 
> # Increase the cache size
> cache-size=1500
> 
> ---- Logs ---------------------------------------------------------------------
> 
> dnsmasq    | dnsmasq[9]: started, version 2.80 cachesize 1500
> dnsmasq    | dnsmasq[9]: compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth DNSSEC loop-detect inotify dumpfile
> dnsmasq    | dnsmasq-dhcp[9]: DHCP, IP range 192.168.1.200 -- 192.168.1.250, lease time 12h
> dnsmasq    | dnsmasq-dhcp[9]: DHCPv6, IP range ::254.19.0.1 -- ::254.19.255.255, lease time 12h, template for eth0
> dnsmasq    | dnsmasq-dhcp[9]: DHCPv4-derived IPv6 names on eth0
> dnsmasq    | dnsmasq-dhcp[9]: router advertisement on eth0
> dnsmasq    | dnsmasq-dhcp[9]: IPv6 router advertisement enabled
> dnsmasq    | dnsmasq[9]: using local addresses only for domain ewlan.es
> dnsmasq    | dnsmasq[9]: using nameserver 62.14.63.145#53
> dnsmasq    | dnsmasq[9]: using nameserver 62.14.2.1#53
> dnsmasq    | dnsmasq[9]: read /etc/hosts - 4 addresses
> dnsmasq    | dnsmasq-dhcp[9]: DHCPRELEASE(eth0) 192.168.1.209 52:54:00:1a:99:1b
> dnsmasq    | dnsmasq-dhcp[9]: RTR-SOLICIT(eth0) 52:54:00:1a:99:1b
> dnsmasq    | dnsmasq-dhcp[9]: DHCPDISCOVER(eth0) 192.168.1.209 52:54:00:1a:99:1b
> dnsmasq    | dnsmasq-dhcp[9]: DHCPOFFER(eth0) 192.168.1.209 52:54:00:1a:99:1b
> dnsmasq    | dnsmasq-dhcp[9]: DHCPREQUEST(eth0) 192.168.1.209 52:54:00:1a:99:1b
> dnsmasq    | dnsmasq-dhcp[9]: DHCPACK(eth0) 192.168.1.209 52:54:00:1a:99:1b sabredav
> dnsmasq    | dnsmasq-dhcp[9]: DHCPDISCOVER(eth0) 192.168.1.132 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPOFFER(eth0) 192.168.1.203 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPDISCOVER(eth0) 192.168.1.132 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPOFFER(eth0) 192.168.1.203 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPDISCOVER(eth0) 192.168.1.132 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPOFFER(eth0) 192.168.1.203 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPDISCOVER(eth0) 192.168.1.132 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPOFFER(eth0) 192.168.1.203 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPDISCOVER(eth0) 192.168.1.132 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPOFFER(eth0) 192.168.1.203 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPDISCOVER(eth0) 192.168.1.132 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPOFFER(eth0) 192.168.1.203 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPDISCOVER(eth0) 192.168.1.132 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPOFFER(eth0) 192.168.1.203 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPDISCOVER(eth0) 192.168.1.132 52:54:00:76:2a:ec
> dnsmasq    | dnsmasq-dhcp[9]: DHCPOFFER(eth0) 192.168.1.203 52:54:00:76:2a:ec
> ...
> 
> 
> 
> 
> 
> _______________________________________________
> Dnsmasq-discuss mailing list
> Dnsmasq-discuss at lists.thekelleys.org.uk
> https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss




More information about the Dnsmasq-discuss mailing list