Quoting Darragh Ó Héiligh (lists at digitaldarragh.com):
> Is there a way that anyone can tell me of testing the connection for
> blocked protocols or ports?
If feasible, try putting your Ubuntu laptop on the outside LAN segment
that reaches the Juniper router, then doing this:
# nmap -vv -sT -sR -O -I -oN nmap-tcpscan.log -n $JUNIPER_IP
# nmap -vv -sU -sR -O -oN nmap-udpscan.log -n $JUNIPER_IP
# nmap -vv -sA -sR -O -oN nmap-ackscan.log -n $JUNIPER_IP
Those logfiles should be revealing.
If it's not feasible to put the laptop on the outside LAN (e.g., the
Juniper's WAN port is -- dunno -- maybe set up to connect only to DSL
and not ethernet), then you might be obliged to probe from further out
on the wider Internet. That's better than nothing, but of course then
you might be seeing the effect of filtering at intermediate points such
as the DSL provider.
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