Networking / Browser / DNS problem

[Suppi]

Disbling ipv6 in iceweasel did not help ( type about:config in the adress bar and filter for ipv6 )
Neither did changing to lynx.
The problem was one of the routers ( from Digitus ) I used. After removeing it, everything was fine.
Now I'm using a SMC Barricade instead while writing this post from Iceweasel.

Very Surprising! I think it's time for a Linux certification of hardware like Microsoft did it.
Makes your choice much easier.

Suppi

[dram]

When using dhcp behind a router, what has worked for me for years when dns resolution problems cropped up, was to place my isp's primary and backup dns nameservers in the router's setup page, which helps bypass some dns issues for routers that are typically windows/mac-centric. Once the addresses are placed into the router itself, just restart networking, or reboot the computer.

This is usually the case when "my windows / mac computer works, but not linux" - assuming you don't have further issues with ipv6 or network connectivity in general.

If you don't know your isp's dns addresses, there are alternates like those seen at the bottom right of opendns.com. Since addresses can be altered in cached messages, verify them by visiting the site yourself.

Older routers sometimes had problems with ipv6, so one way to avoid that is to force Iceweasel to use ipv4 by typing "about:config" in the url bar, and searching for IPV6 in the filter. Change network.dns.disableipv6 to "true" by doubleclicking the preference name. I usually restart Iceweasel after that.

Note that I haven't touched upon globally disabling ipv6, only in Iceweasel. Putting the dns server addresses in the router itself has cured quite a few problems, especially in mixed-os environments - now everyone is on an equal footing because the router doesn't play with dns.