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Groups > comp.os.linux.networking > #4089

Re: Captive portals ignore some URLs

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On 24 Sep 2017 22:52:45 GMT, in the Usenet newsgroup comp.os.linux.networking,
in article <oq9cvt02pcf@news4.newsguy.com>, Charlie Gibbs wrote:

>Many captive portals seem to be picky about which URL you initially
>try to access.  If it isn't a well-known site like Google, many
>portals will silently ignore any attempts to access the site, and
>the browser will hang.

Not enough information.    Find a command line and run

/sbin/ifconfig wlan0  (or what-ever)
  does your system have AN IP address on the wireless interface?

/sbin/route -n
  does your system have a "route to the world" (0.0.0.0/0) using some
locally reachable host as a router?

cat /etc/resolv.conf
  does your system have an address of a name server?

host www.ibiblio.org           or similar
  does your system resolve that to an IP (here, 152.19.134.40)

Point your browser (what-ever that is) at www.google.com, AND THEN
look at the output of  /bin/netstat -atn
  does a connection exist?   If so, does the IP on the far end
  resolve to some host in google.com land?  Or it is some proxy
  trying to fake it?  Note that an over-advertised site like google
  will also have eleventyseven other links to content/ad servers.

/usr/sbin/traceroute -n 152.19.134.40
  do you eventually get there?  (tcptraceroute is better, but maybe
  your 'traceroute' program has a -T option)

now, point your browser at www.ibiblio.org. Does
  "/bin/netstat -atn | grep 152.19"  show a connection attempt/made?

Some spots want to proxy everything - the only way around that is to
go elsewhere OR have a VPN tunnel.  (Another way - I have a few sites
listed in my /etc/hosts file, to get around some proxy servers.)
Other hot-spots want to block skript kiddieZ by not allowing IP
connections to other than ``approved'' sites and maybe "approved"
destination port numbers (using a firewall).   Go elsewhere.

My local (public) library offers free WiFi, AFTER you are intercepted
by their authentication server and are redirected to a "I'll be nice
and not surf pr0n" page.  I've learned to FIRST attempt to connect to
the library's "home" web-page, get the authentication out of the way
and THEN do what-ever networking activities I wanted to do.

A nearby grocery store offers free WiFi along with a Starbucks in
the same store (you have to choose the correct SSID, and Starbucks
gives you a temporary password - but I don't do yuppie coffee, so
I've never tried them). The grocery proxies EVERYTHING (so they can
deluge you in ads), and their firewall only allows the proxy through.
No DNS, telnet, ftp, ssh or sftp.    As said - go elsewhere.

        Old guy

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Thread

Captive portals ignore some URLs Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2017-09-24 22:52 +0000
  Re: Captive portals ignore some URLs not@telling.you.invalid (Computer Nerd Kev) - 2017-09-24 23:08 +0000
  Re: Captive portals ignore some URLs not@telling.you.invalid (Computer Nerd Kev) - 2017-09-26 23:08 +0000
    Re: Captive portals ignore some URLs Moe Trin <ibuprofin@painkiller.example.tld.invalid> - 2017-09-27 03:53 +0000
      Re: Captive portals ignore some URLs Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2017-09-27 15:38 +0000
        Re: Captive portals ignore some URLs Moe Trin <ibuprofin@painkiller.example.tld.invalid> - 2017-09-27 19:11 +0000
  Re: Captive portals ignore some URLs Moe Trin <ibuprofin@painkiller.example.tld.invalid> - 2017-09-27 19:10 +0000
    Re: Captive portals ignore some URLs Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2017-09-30 00:42 +0000
      Re: Captive portals ignore some URLs Moe Trin <ibuprofin@painkiller.example.tld.invalid> - 2017-09-30 23:19 +0000
        Re: Captive portals ignore some URLs Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2017-10-02 15:33 +0000
          Re: Captive portals ignore some URLs Moe Trin <ibuprofin@painkiller.example.tld.invalid> - 2017-10-04 03:14 +0000

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