Re: Network connection


"Alex Monro" <alex_monro@xxxxxxxxxxx> wrote in message
news:43ac4e14$0$256$5a6aecb4@xxxxxxxxxxxxxxxxxxxx
> Kit wrote:
>
> > "Kit" <kit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> > news:43a9e0f0$1_1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >>> Hmm... Proxy or nameserver settings of some sort?
> >>>
> >>> Can you telnet www.yahoo.co.uk 80 and get an open session? If you can,
> >>> try
> >>> typing GET / in and press return. Does stuff come back ok?
> >>>
> >>
> >> Cannot "telnet www.yahoo.com 80"; it sits there a while, then says
> >> "Trying 1.0.0.0..." then times out.
> >>
> >> Is it time to read about proxies?
> > ---------------------------------------------------------------
> > Had a day of Xmas duties yesterday! Managed to read a bit about proxy
> > servers on Wikipedia and reverted some vandalism there. Still not much
the
> > wiser though.
> > Anyway, here are my responses to your questions & suggestions:
> >
> >>Hmm... (again). Is "Trying 1.0.0.0..." a literal quote?
> > Yes.
> >
> > If that's the case then something is wrong with DNS and I'm a bit
confused
> > as to why a ping works. Can you try the following:
> >
> >>1. ping www.yahoo.co.uk
> >>You should see it turn into an IP address (I get 217.12.3.11 ATM).
> > I get 217.12.3.11 also.
> >
> >
> >>2. Now telnet www.yahoo.co.uk 80
> >>and see what IP it tries.
> >
> > Trying 217.12.3.11...
> > Connected to www.yahoo.co.uk.
> > Escape character is '^]'.
> >
> > (and then after a while of me doing nothing)
> > Connection closed by foreign host.
> >
> That is what should happen.
> >
> >
> >>3. Try /usr/sbin/traceroute -n www.yahoo.co.uk
> >>Where does that get to.
> >
> > groundhog:/home # /usr/sbin/traceroute -n www.yahoo.co.uk
> > traceroute to www.yahoo.co.uk (1.0.0.0), 30 hops max, 40 byte packets
> > 1 192.168.0.1 1.068 ms 0.550 ms 0.542 ms
> > 2 212.74.111.234 15.153 ms 17.680 ms 14.484 ms
> > 3 212.74.106.166 13.940 ms 14.722 ms 14.459 ms
> > 4 212.74.111.130 17.029 ms 19.798 ms 17.539 ms
> > 5 212.74.108.10 19.213 ms 18.076 ms 20.818 ms
> > 6 * 213.200.77.253(N!) 19.588 ms (N!) 18.954 ms
> >
> >
> >
> >>4. Try /usr/sbin/traceroute www.yahoo.co.uk
> >>Not in numerical mode this time - see if DNS works.
> >
> > groundhog:/home # /usr/sbin/traceroute www.yahoo.co.uk
> > traceroute to www.yahoo.co.uk (1.0.0.0), 30 hops max, 40 byte packets
> > 1 mygateway.ar7 (192.168.0.1) 0.668 ms 0.543 ms 0.621 ms
> > 2 lo99.bhm (212.74.111.234) 14.556 ms 16.992 ms 14.671 ms
> > 3 212.74.106.166 16.026 ms 15.490 ms 16.015 ms
> > 4 pos3 (212.74.111.130) 17.479 ms 20.674 ms 16.849 ms
> > 5 pos3 (212.74.108.10) 19.057 ms 41.267 ms 29.464 ms
> > 6 * so (213.200.77.253)(N!) 18.769 ms *
> >
> This looks reasonable.
>
> >>If you've said 1.0.0.0 for the sake of brevity and it did indeed try a
> >>real IP address but just timed out then this is odd and might be some
sort
> >>of proxy or port not allowed on the firewall.
> >
> >>In this case try telnetting to some other services/ports, for example:
> >
> >>telnet mailin-03.mx.aol.com 25
> >
> >>or your ISP POP3 server on 110
> >
> > chris@groundhog:~> telnet pop3.lineone.net 110
> > Trying 1.0.0.0...
> > telnet: connect to address 1.0.0.0: Connection timed out
> >
> Sorry for dissapearing for a bit - had a touch of 'flu.
>
> This is _weird_! pop3.lineone.net is _NOT_ 1.0.0.0, it's 212.74.114.58
> (unless lineone are doing something _very_ strange with their internal
> DNS)
>
> What does dig tell you the IP for that server is?
> (I get the following from here:
> alex@finn:~> dig pop3.lineone.net
>
> ; <<>> DiG 9.2.2 <<>> pop3.lineone.net
> ;; global options: printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9330
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2
>
> ;; QUESTION SECTION:
> ;pop3.lineone.net. IN A
>
> ;; ANSWER SECTION:
> pop3.lineone.net. 13172 IN A 212.74.114.58
>
> ;; AUTHORITY SECTION:
> lineone.net. 3253 IN NS ns0.tiscali.co.uk.
> lineone.net. 3253 IN NS ns0.as9105.com.
>
> ;; ADDITIONAL SECTION:
> ns0.as9105.com. 120357 IN A 212.139.129.130
> ns0.tiscali.co.uk. 98683 IN A 212.74.114.132
> )
>
> I guess with tiscali anything's possible!
>
> I'm just wondering if lineone do some weird proxying for all the services
> they support. I think it's theoretically possible they could return
> different addresses for lookups on their servers to clients coming from
> inside their network to what they return for external lookups. That
> would be - unconventional.
>
> Another possibility - do you have an /etc/hosts file? Is there anything
> about pop3.lineone.net in there?
>
> Can you connect to www.yahoo.co.uk with a browser? You seem to be able
> to ping & telnet to it. Can you telnet to port 80 of some of the other
> sites that you weren't able to access with a browser? Are there any
> proxies set in your browsers?
> --
> Alex Monro, Exeter, UK Life is like Windows - the documentation
> alexm at pobox dot com (No HTML) is useless, and it crashes horribly
> Running on GNU/Linux (SuSE 8.2) from time to time...
> GPG key 68F8 6270 available from hkp://blackhole.pca.dfn.de

Hi Alex, welcome back.
Still stuck in the ditch here! I cannot connect to anything with a browser
(Konq, Firefox), and have tried changing proxy settings without success, but
since I don't understand proxy servers I was just stabbing in the dark.
I will give your suggestions a try tomorrow.




.

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