Urgent help needed please

[LukeH]

Hi,
I have an RT-AC56U with Merlin 384.4_2 now. I have chrooted debian where I install pretty much everything I want including transmission-daemon.
Everything worked pretty well for me for years with this setup until I installed the latest Merlin - probably cause I didn't changed anything else.
Issues tarted when I noticed the torrents won't download and log saying "Scrape error: Could not connect to tracker". Also noticed the error "transmission-daemon[2961]: UDP Failed to set receive buffer: requested 4194304, ..." and tryed everything I could find on this forum and google about it but no luck.
When finally I decided to try to reinstall transmission I got this:

root@AsusGate:/# apt-get update
Err http://security.debian.org stretch/updates InRelease

Err http://download.opensuse.org  InRelease

Err http://httpredir.debian.org stable InRelease

Err http://security.debian.org stretch/updates Release.gpg
  Temporary failure resolving 'security.debian.org'
Err http://download.opensuse.org  Release.gpg
  Temporary failure resolving 'download.opensuse.org'
Err http://httpredir.debian.org stretch-updates InRelease

Err http://httpredir.debian.org stable Release.gpg
  Temporary failure resolving 'httpredir.debian.org'
Err http://httpredir.debian.org stretch-updates Release.gpg
  Temporary failure resolving 'httpredir.debian.org'
Reading package lists... Done
W: Failed to fetch http://httpredir.debian.org/debian/dists/stable/InRelease

At this time I decided to write this post. Any solutions? Or how should I rollback Merlin and to which version if that could be the issue (I don't recall exactly which I had before but probably jumped a couple of releases)?
Thanks

EDIT: seems to me that nothing related to wan communication works anymore from the chrooted debian (which I installed way back with indications from https://hqt.ro/):

root@AsusGate:/# apt-get install iputils-ping
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  libnettle6
The following NEW packages will be installed:
  iputils-ping libnettle6
0 upgraded, 2 newly installed, 0 to remove and 74 not upgraded.
Need to get 264 kB of archives.
After this operation, 495 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
WARNING: The following packages cannot be authenticated!
  libnettle6 iputils-ping
Install these packages without verification? [y/N] y
Err http://httpredir.debian.org/debian/ stable/main libnettle6 armel 3.3-1+b2
  Temporary failure resolving 'httpredir.debian.org'
Err http://httpredir.debian.org/debian/ stable/main iputils-ping armel 3:20161105-1
  Temporary failure resolving 'httpredir.debian.org'
E: Failed to fetch http://httpredir.debian.org/debian/pool/main/n/nettle/libnettle6_3.3-1+b2_armel.deb  Temporary failure resolving 'httpredir.debian.org'

E: Failed to fetch http://httpredir.debian.org/debian/pool/main/i/iputils/iputils-ping_20161105-1_armel.deb  Temporary failure resolving 'httpredir.debian.org'

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

root@AsusGate:/# wget --spider www.google.com
converted 'http://www.google.com' (ANSI_X3.4-1968) -> 'http://www.google.com' (UTF-8)
Spider mode enabled. Check if remote file exists.
--2018-04-25 08:04:20--  http://www.google.com/
Resolving www.google.com (www.google.com)... failed: Name or service not known.
wget: unable to resolve host address 'www.google.com'
root@AsusGate:/# exit
exit
lukeh@AsusGate:/tmp/home/root# wget --spider www.google.com
Spider mode enabled. Check if remote file exists.
--2018-04-25 11:04:54--  http://www.google.com/
Resolving www.google.com... 2a00:1450:4005:800::2004, 172.217.16.68
Connecting to www.google.com|2a00:1450:4005:800::2004|:80... failed: Network is unreachable.
Connecting to www.google.com|172.217.16.68|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 5011 (4.9K) [text/html]
Remote file exists and could contain further links,
but recursion is disabled -- not retrieving.

EDIT2: or just the DNS or something:

root@AsusGate:/# wget --spider 172.217.16.68
converted 'http://172.217.16.68' (ANSI_X3.4-1968) -> 'http://172.217.16.68' (UTF-8)
Spider mode enabled. Check if remote file exists.
--2018-04-25 08:16:53--  http://172.217.16.68/
Connecting to 172.217.16.68:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: http://www.google.com/ [following]
converted 'http://www.google.com/' (ANSI_X3.4-1968) -> 'http://www.google.com/' (UTF-8)
Spider mode enabled. Check if remote file exists.
--2018-04-25 08:16:54--  http://www.google.com/
Resolving www.google.com (www.google.com)... failed: Name or service not known.
wget: unable to resolve host address 'www.google.com'

 

[LukeH]

Geez...setting google's dns servers instead of "Connect to DNS Server automatically" solved all my issues. Including transmission-daemon issues which I noticed reported by others too here for example: https://www.snbforums.com/threads/b...ta-is-now-available.44438/page-13#post-380949

I always relayed on automatic DNS in the past (except when I was playing with them to test things) and all those things worked well. So do you think my ISP did something or was it the Merlin update - note that only chrooted debian seem to have been affected?