Well that's interesting, sure does tell you something.
Something is foobar for sure, if nothing else.
is not responding
Certainly is a major clue.
Are you Cable or DSL?
Looks like Cable, however 10 & 11 indicate possible DSL, need to confirm that.
Also 10 is not a private address space, 11 is.
If your Cable then 10 is foobar.
Looks like a foobar network on the private side.
How about a network system map.
Detail with model info of hardware, for example.....
modem # & IP >>> IP -- firewall # -- IP >>> switch >>> sme IP etc.
With a foobar network config
yum will not send or receive packets at all or properly at the socket layer.
What that means is you have to fix your network.
If there are any transparent proxies, they at this point appear to be ok, since all ahead of your (modem) private network are responding properly.
The concept is, the more info the faster a solution.
Also, your much better off in Gateway Mode, however you can switch to that later, after we get Server only working.
No sense in compounding the problems at this point.
IMHO this community needs a good networking tutorial, would you not agree?
I'm working on it, just need a round tuit.