i can't open, ping,.. any domain after upgrade debian

Question

after upgrade debian i cannot open or ping any domain even in firefox (but i havnt any problem via proxy).

for example wget:

unable to resolve host address ‘google.com’

but i can work with ip (add in /etc/hosts) or dig any domian

; <<>> DiG 9.10.3-P4-Debian <<>> debian.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35527
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;debian.org.            IN  A

;; ANSWER SECTION:
debian.org.     45  IN  A   149.20.20.22
debian.org.     45  IN  A   5.153.231.4
debian.org.     45  IN  A   140.211.15.34
debian.org.     45  IN  A   130.89.148.14
debian.org.     45  IN  A   128.31.0.62

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Jun 01 09:03:52 IRDT 2016
;; MSG SIZE  rcvd: 119

i also can access to ip directly or access to domain with /etc/hosts

my /etc/resolv.conf:

nameserver 127.0.0.1 
nameserver 8.8.8.8

and my /etc/NetworkManager/NetworkManager.conf:

[main]
plugins=ifupdown,keyfile
#dns=dnsmasq
[ifupdown]
managed=false

when i run nmcli dev show | grep IP4.DNS:

IP4.DNS[1]:                             127.0.0.1
IP4.DNS[2]:                             8.8.8.8

apparently every thing is ok but i cannot access to any domain directly.

Any help with this would be best appreciated!

Answer 1

Why do you have the line nameserver 127.0.0.1 as the first option? You can put it after primary dns like 8.8.8.8. Again, in your /etc/NetworkManager/NetworkManager.conf, try to set

dns=default