I've contacted them about this. The issue is that they appears to have removed the IPv4 address and are solely using IPv6 but have not reflected this in DNS:
Hello,
I am having difficulty using any Debian based distribution as one of my main mirrors is ftp3.nrc.ca which appears to be IPv6-only. Could you please update DNS to reflect this so that timeouts do not occur on IPv4-only hosts?
root@voiplab:~# dig +noall +answer ftp3.nrc.ca
ftp3.nrc.ca. 86200 IN A 132.246.2.23
root@voiplab:~# dig +noall +answer -t AAAA ftp3.nrc.ca
ftp3.nrc.ca. 86193 IN AAAA 2604:8400:0:2::5
root@voiplab:~# apt-get install dahdi
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
dahdi-linux fxload
The following NEW packages will be installed:
dahdi dahdi-linux fxload
0 upgraded, 3 newly installed, 0 to remove and 6 not upgraded.
Need to get 433 kB of archives.
After this operation, 1,716 kB of additional disk space will be used.
Do you want to continue? [Y/n]
WARNING: The following packages cannot be authenticated!
fxload dahdi-linux dahdi
Install these packages without verification? [y/N] y
Err
http://ftp3.nrc.ca/debian/ jessie/main fxload amd64 0.0.20081013-1
Cannot initiate the connection to ftp3.nrc.ca:80 (2604:8400:0:2::5). - connect (101: Network is unreachable) [IP: 2604:8400:0:2::5 80]
Err
http://ftp3.nrc.ca/debian/ jessie/main dahdi-linux all 1:2.10.0.1~dfsg-1
Cannot initiate the connection to ftp3.nrc.ca:80 (2604:8400:0:2::5). - connect (101: Network is unreachable) [IP: 2604:8400:0:2::5 80]
Err
http://ftp3.nrc.ca/debian/ jessie/main dahdi amd64 1:2.10.0.1-1
Cannot initiate the connection to ftp3.nrc.ca:80 (2604:8400:0:2::5). - connect (101: Network is unreachable) [IP: 2604:8400:0:2::5 80]
E: Failed to fetch
http://ftp3.nrc.ca/debian/pool/main/...13-1_amd64.deb Cannot initiate the connection to ftp3.nrc.ca:80 (2604:8400:0:2::5). - connect (101: Network is unreachable) [IP: 2604:8400:0:2::5 80]
E: Failed to fetch
http://ftp3.nrc.ca/debian/pool/main/...dfsg-1_all.deb Cannot initiate the connection to ftp3.nrc.ca:80 (2604:8400:0:2::5). - connect (101: Network is unreachable) [IP: 2604:8400:0:2::5 80]
E: Failed to fetch
http://ftp3.nrc.ca/debian/pool/main/....1-1_amd64.deb Cannot initiate the connection to ftp3.nrc.ca:80 (2604:8400:0:2::5). - connect (101: Network is unreachable) [IP: 2604:8400:0:2::5 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Thanks,
Darin Luckie
Ingénieur du réseaux VoIP / VoIP Network Engineer