I cant be bothered with grammar police & the like but i had a wee bit trouble reading that block of text without highlighting the individual lines.Mabey my eye`s are just not what they used to be.
If you posted your modems config page though the networking guru`s here might be better able to spot something.
http://192.168.100.1/
Also,have you tried just connecting the modem directly to your PC`s,without the router?Mabey try using different DNS.
Quote:
also tried checking automatically detect settings
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Unless you`ve set your router/PC`s to use static IP`s then you would need to keep that checked i believe.If i`ve even read you right that is.
I`m guessing that your not someone who might need his ICMP filtering turned off though so unless you know what your doing i`d leave it alone.