Unexpected behavior:Ubuntu-Mate 16.04.1 and DHCP/DNS
-
Hi all,
I'm confused and befuddled about the situation on one of my PCs on which I installed Ubuntu-Mate 16.04.1 yesterday. It cannot resolve names on my LAN.I spent more time than I should have trying to figure out what I had done wrong with a new ( <q week)="" pfsense="" install="" until="" i="" realized="" the="" issue="" was="" on="" pc="" end="" of="" connection.="" it="" turns="" out="" that="" etc="" resolv.conf="" is="" pointing="" to="" name="" servers="" have="" configured="" in="" pfsense.="" all="" my="" other="" pcs="" (including="" others="" also="" run="" ubuntu="" 14.04)="" are="" either="" localhost="" (127.0.0.1="" -="" presume="" they="" forwarding="" firewall)="" or="" directly="" firewall.="" frankly="" i'm="" astounded="" none="" these="" seems="" an="" identical="" dns="" configuration.<br="">I cannot see any way that the PC in question is getting that DNS entry except through DHCP. I have no idea if that is a result of configuration on pfSense or on the PC itself (or some combination of the two.)
Any help resolving this is most welcome.
The configuration is as follows:
hbarta@olive:~$ inxi -S System: Host: olive Kernel: 4.4.0-57-generic x86_64 (64 bit) Desktop: MATE 1.12.1 Distro: Ubuntu 16.04 xenial hbarta@olive:~$ cat /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 8.8.8.8 nameserver 8.8.4.4 nameserver 2001:4860:4860::8888 search localdomain hbarta@olive:~$ cat /etc/nsswitch.conf # /etc/nsswitch.conf # # Example configuration of GNU Name Service Switch functionality. # If you have the `glibc-doc-reference' and `info' packages installed, try: # `info libc "Name Service Switch"' for information about this file. passwd: compat group: compat shadow: compat gshadow: files hosts: files mdns4_minimal [NOTFOUND=return] dns networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis hbarta@olive:~$On one PC - an older install on a laptop - I see
hbarta@yggdrasil:~$ inxi -S System: Host: yggdrasil Kernel: 4.4.0-47-generic x86_64 (64 bit) Console: tty 1 Distro: Ubuntu 16.04 xenial hbarta@yggdrasil:~$ cat /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 127.0.1.1 search localdomain hbarta@yggdrasil:~$ cat /etc/nsswitch.conf # /etc/nsswitch.conf # # Example configuration of GNU Name Service Switch functionality. # If you have the `glibc-doc-reference' and `info' packages installed, try: # `info libc "Name Service Switch"' for information about this file. passwd: compat group: compat shadow: compat gshadow: files hosts: files mdns4_minimal [NOTFOUND=return] dns networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis hbarta@yggdrasil:~$I have four DNS servers configured in pfSense - 2 x IPV4 and 2 x IPV6 for Google. Boxes for DNS Server Override and Disable DNS Forwarder are both unchecked.
I have just upgraded to 2.3.2-RELEASE-p1 (AKA 2.3.2_1)
Any suggestions on how to resolve this (pun intended - I kill myself! ;) ) are most appreciated!
Edit: After I solve this, I need to figure out how this host gets to external name servers. I thought I had that blocked. :-/
Edit.2 Additional information. This post (http://askubuntu.com/questions/837982/how-to-configure-local-dns-lookup-in-ubuntu-16-10/838395#838395) ends with a suggestion:
sudo apt purge libnss-resolve sudo apt install libnss-resolveI tried that and it fixed the problem! :D
I rebooted and the problem was back! :(I'm starting to think this is more likely an Ubuntu issue.</q>
-
Yeah, bingo, this forum is not for Ubuntu.