not able to get hostname from ip address for local IPs

[fuadk]

Hi,
I have gateway installed on Ubuntu, and not able to get hostname for local IPs, using nslookup or programmatically using getnameinfo
nslookup gives:

fuad@URLF:~$ nslookup 192.168.1.107
Server:        127.0.1.1
Address:    127.0.1.1#53


** server can't find 107.1.168.192.in-addr.arpa: NXDOMAIN

The DNS configuration is shown below using nuclei:

nmcli device show|grep DNS
IP4.DNS[1]:                             41.128.225.225

I tried adding router as DNS using nuclei:

nmcli connection edit type ethernet
set ipv4.DNS 192.168.1.1

saved and quit but still the same
below is all the output of nmcli show:
------

GENERAL.DEVICE:                         bridge0
GENERAL.TYPE:                           bridge
GENERAL.HWADDR:                         70:F3:95:09:2F:D5
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     Bridge connection 1
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/0
IP4.ADDRESS[1]:                         192.168.1.135/24
IP4.GATEWAY:                            192.168.1.1
IP4.ROUTE[1]:                           dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.DNS[1]:                             41.128.225.225
IP6.ADDRESS[1]:                         fd2c:d457:2852:1:f1c2:dc5d:d6e:6e6f/64
IP6.ADDRESS[2]:                         fe80::f965:9dc3:db65:ea36/64
IP6.GATEWAY:                            
IP6.ROUTE[1]:                           dst = fd2c:d457:2852:1::/64, nh = ::, mt = 425


GENERAL.DEVICE:                         enp0s25
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         70:F3:95:09:2F:D5
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     bridge0 slave 2
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/1
WIRED-PROPERTIES.CARRIER:               on


GENERAL.DEVICE:                         enp17s0
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         78:54:2E:70:07:30
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     bridge0 slave 1
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/2
WIRED-PROPERTIES.CARRIER:               on


GENERAL.DEVICE:                         lo
GENERAL.TYPE:                           loopback
GENERAL.HWADDR:                         00:00:00:00:00:00
GENERAL.MTU:                            65536
GENERAL.STATE:                          10 (unmanaged)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --
IP4.ADDRESS[1]:                         127.0.0.1/8
IP4.GATEWAY:                            
IP6.ADDRESS[1]:                         ::1/128
IP6.GATEWAY:

--------

Regards,
Fuad

[SeijiSensei]

Are you using BIND9 and isc-dhcp-server to handle IP assignments and domain name resolution? It's possible to link them together so that new machines are added automatically to the DNS server records. See https://wiki.samba.org/index.php/Con...rds_with_BIND9

Without a local DNS server, I don't know how you would resolve IPs to domain names for addresses in private IP subnets like 192.168/16. I presume you want something more generalizable than /etc/hosts files on all the clients.