Public bug reported:
In Ubuntu 16.04, I've configured dnsmasq to reply on subnet=10.160.37.0/24, yet
it replies even when it gets an IP on subnet=10.161.254.0/24.
I've only seen this after clean system restart. If I restart dnsmasq later on,
it works as expected.
Maybe when dnsmasq starts, the network isn't up yet, and it incorrectly
initializes some networking information? I'm using network-manager with DHCP.
Details:
$ egrep -rv '^#|^$' /etc/dnsmasq.*
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-range=10.160.37.0,proxy
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-range=192.168.67.20,192.168.67.250,8h
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:enable-tftp
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:tftp-root=/var/lib/tftpboot/
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-option=17,/opt/ltsp/i386
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-vendorclass=etherboot,Etherboot
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-vendorclass=pxe,PXEClient
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-vendorclass=ltsp,"Linux ipconfig"
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-boot=net:pxe,/ltsp/i386/pxelinux.0
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-boot=net:etherboot,/ltsp/i386/nbi.img
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-boot=net:ltsp,/ltsp/i386/lts.conf
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-option=vendor:pxe,6,2b
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:dhcp-no-override
/etc/dnsmasq.d/ltsp-server-dnsmasq.conf:pxe-service=X86PC, "Boot from network",
/ltsp/i386/pxelinux
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
group default qlen 1000
link/ether d0:50:99:a6:bc:0a brd ff:ff:ff:ff:ff:ff
inet 10.161.254.185/24 brd 10.161.254.255 scope global dynamic enp2s0
valid_lft 431873sec preferred_lft 431873sec
inet6 fe80::f363:c1e2:9cb8:d9e2/64 scope link
valid_lft forever preferred_lft forever
$ sudo netstat -nap | grep dnsmasq
[sudo] password for administrator:
tcp 0 0 0.0.0.0:53 0.0.0.0:* LISTEN
843/dnsmasq
tcp6 0 0 :::53 :::* LISTEN
843/dnsmasq
udp 0 0 0.0.0.0:53 0.0.0.0:*
843/dnsmasq
udp 0 0 0.0.0.0:67 0.0.0.0:*
843/dnsmasq
udp 0 0 0.0.0.0:69 0.0.0.0:*
843/dnsmasq
udp 0 0 0.0.0.0:4011 0.0.0.0:*
843/dnsmasq
udp6 0 0 :::53 :::*
843/dnsmasq
udp6 0 0 :::69 :::*
843/dnsmasq
unix 2 [ ] DGRAM 15746 843/dnsmasq
$ grep dnsmasq /var/log/syslog | tail -n 30
Dec 19 10:52:17 ltsp-server systemd[1]: Starting dnsmasq - A lightweight DHCP
and caching DNS server...
Dec 19 10:52:17 ltsp-server dnsmasq[630]: dnsmasq: syntax check OK.
Dec 19 10:52:20 ltsp-server dnsmasq[843]: started, version 2.75 cachesize 150
Dec 19 10:52:20 ltsp-server dnsmasq[843]: compile time options: IPv6 GNU-getopt
DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth DNSSEC loop-detect
inotify
Dec 19 10:52:20 ltsp-server dnsmasq[843]: DNS service limited to local subnets
Dec 19 10:52:20 ltsp-server dnsmasq-dhcp[843]: DHCP, IP range 192.168.67.20 --
192.168.67.250, lease time 8h
Dec 19 10:52:20 ltsp-server dnsmasq-dhcp[843]: DHCP, proxy on subnet 10.160.37.0
Dec 19 10:52:20 ltsp-server dnsmasq-tftp[843]: TFTP root is /var/lib/tftpboot/
Dec 19 10:52:20 ltsp-server dnsmasq[843]: no servers found in
/var/run/dnsmasq/resolv.conf, will retry
Dec 19 10:52:20 ltsp-server dnsmasq[843]: read /etc/hosts - 7 addresses
Dec 19 10:52:23 ltsp-server systemd[1]: Started dnsmasq - A lightweight DHCP
and caching DNS server.
Dec 19 10:52:29 ltsp-server dnsmasq[843]: reading /var/run/dnsmasq/resolv.conf
Dec 19 10:52:29 ltsp-server dnsmasq[843]: ignoring nameserver 127.0.0.1 - local
interface
Dec 19 10:52:29 ltsp-server dnsmasq[843]: using nameserver 194.63.238.4#53
Dec 19 10:52:29 ltsp-server dnsmasq[843]: using nameserver 8.8.8.8#53
Dec 19 08:52:47 ltsp-server dnsmasq-dhcp[843]: PXE(enp2s0) 52:54:00:8f:74:ad
proxy
Dec 19 08:52:47 ltsp-server dnsmasq-dhcp[843]: PXE(enp2s0) 10.161.254.195
52:54:00:8f:74:ad /ltsp/i386/pxelinux.0
Dec 19 08:52:47 ltsp-server dnsmasq-tftp[843]: sent
/var/lib/tftpboot/ltsp/i386/pxelinux.0 to 10.161.254.195
...
Note that it replies in "52:54:00:8f:74:ad proxy" while it shouldn't.
If I run this:
# service dnsmasq restart
Then it behaves correctly:
Dec 19 09:01:17 ltsp-server dnsmasq-dhcp[2381]: no address range available for
DHCP request via enp2s0
** Affects: dnsmasq (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1651044
Title:
ProxyDHCP replies on invalid range
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