i have a problem where i can't get any further (due to my limited Linux knowledge). After the upgrade (apt upgrade, apt full-upgrade) from stretch to buster the unbound server did not answer DNS requests anymore. And after some troubleshooting i realized a second ip address on eno2 (lan) adapter.
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$ dig dnswl.org @192.168.1.1
Error message:
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;; reply from unexpected source: 192.168.1.173#53, expected 192.168.1.1#53
I got the unbound server running again by adding "interface-automatic: yes" to the configuration file /etc/unbound/unbound.conf.
Here is some additional information:
1.# netstat -lpn | grep 173
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udp 0 0 192.168.1.173:123 0.0.0.0:* 1751/ntpd
2. # ip adr
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ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether b0:5a:da:87:b1:2c brd ff:ff:ff:ff:ff:ff
inet 172.16.1.2/16 brd 172.16.255.255 scope global noprefixroute eno1
valid_lft forever preferred_lft forever
inet6 fd00::3dbb:3020:1bbe:e6a8/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 6715sec preferred_lft 3115sec
inet6 fe80::b25a:daff:fe87:b12c/64 scope link
valid_lft forever preferred_lft forever
3: eno2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether b0:5a:da:87:b1:2d brd ff:ff:ff:ff:ff:ff
inet 192.168.1.1/24 brd 192.168.1.255 scope global eno2
valid_lft forever preferred_lft forever
inet 192.168.1.173/24 brd 192.168.1.255 scope global secondary noprefixroute eno2
valid_lft forever preferred_lft forever
inet6 fe80::b25a:daff:fe87:b12d/64 scope link
valid_lft forever preferred_lft forever
4: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 100
link/none
inet 10.8.0.1/24 brd 10.8.0.255 scope global tun0
valid_lft forever preferred_lft forever
inet6 fe80::9bb:c208:421b:f191/64 scope link stable-privacy
valid_lft forever preferred_lft forever
3. ip addr show eno2
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3: eno2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether b0:5a:da:87:b1:2d brd ff:ff:ff:ff:ff:ff
inet 192.168.1.1/24 brd 192.168.1.255 scope global eno2
valid_lft forever preferred_lft forever
inet 192.168.1.173/24 brd 192.168.1.255 scope global secondary noprefixroute eno2
valid_lft forever preferred_lft forever
inet6 fe80::b25a:daff:fe87:b12d/64 scope link
valid_lft forever preferred_lft forever
4. cat /etc/network/interfaces
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# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eno1
allow-hotplug eno1
iface eno1 inet static
address 172.16.1.2
netmask 255.255.0.0
network 172.16.0.0
broadcast 172.16.255.255
gateway 172.16.1.1
auto eno2
allow-hotplug eno2
iface eno2 inet static
address 192.168.1.1
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
Does anybody have a tip for me on how to find out where the additional address (192.168.1.173) is generated? With journalctl -b, dmesg or syslog i can see an entry that this address is retrieved via dhcp.
Sometimes the network connections (ssh) to the server are hanging for a couple seconds.
thank you
kind regards thomas