Re: Network connection diagnostics

On 22 Sep 2006, in the Usenet newsgroup comp.os.linux.networking, in article
<1158940869.939484.177940@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, Marco A. Cruz Quevedo
wrote:

Moe Trin wrote:

Marco A. Cruz Quevedo wrote:

When I just log on, I cannot get to internet, unles I manually issue
ifdown eth0, ifup eth0, service network restart.

What distribution - what release? What type of connection to the ISP?

Fedora Core 3, connection is DSL
I found that before issuing the commands mentioned above, I can access
internet if I type IP addresses instead of urls. !? Would this be a
clue?

Certainly - as you note on your later post in response to david, this is
a problem with the missing /etc/resolv.conf. The solution proposed by
"Jack Snodgrass" <jacks_temp_id_indigo@xxxxxxxxxxx> (disabling the
overwriting by the DHCP client) should be one solution, but I'm curious
why the different actions (when booting, the client overwrites with a
blank file, yet when you restart the service, you apparently get the
proper data from the server).

This sounds as if your network configuration scripts are not set correctly,
but there isn't enough information to tell which one[s].

Perhaps, because this happened after upgrading some RPMS. :-(

That might be the dhcp client package - though I thought they were using
'pump' and the last time I looked at fedoralegacy.org, pump wasn't on the
updates list, and the dhcp*-3.0.1 stuff hasn't been updated since July 2005.

Personally, I'd set the name servers in /etc/resolv.conf, and then set the
DHCP client to leave the file alone. Contrary to the mystique, most ISPs do
not move their name servers around that much, because of the hassle of
getting the word of the new address out to the world. If you've looked at
the DNS-HOWTO, you see that an outsider finds the name server by asking the
root servers, which refer to top-level-domain servers, and they are supposed
to provide the IP addresses of the domain's name servers. You should also be
able to get the same data from a 'whois' query. For example, you seem to be
posting from a Uninet S.A. de C.V address block, and if I ask LACNIC about
this, I am told that the name servers are NSGDL2.UNINET.NET.MX at
200.23.242.204, NSMEX2.UNINET.NET.MX at 200.33.146.204, and
NSMTY2.UNINET.NET.MX at 200.33.148.205, and that information was last changed
in May, when the block 189.128.0.0/10 was allocated by LACNIC. ISPs use DHCP
(Dynamic Host Configuration Protocol) because this makes it simple for the
users - not that the name servers are dancing about.

Old guy
.

Relevant Pages

  • Re: DHCP
    ... The DHCP Client service was successfully sent a start control. ... "Meinolf Weber" wrote: ... I do not intend to change DNS or DHCP servers. ...
    (microsoft.public.windows.server.general)
  • Re: DHCP
    ... This server was started as a windows 2003 server from the ... Servers with Static IP addresses & they all have the same problem that the ... The DHCP Client service was successfully sent a start control. ...
    (microsoft.public.windows.server.general)
  • Re: connected but cannot get to Internet
    ... configured to be a DHCP client. ... there is connection but no IP. ... > Pinging the snap servers but they all timed out. ...
    (microsoft.public.win2000.networking)
  • Re: DHCP
    ... The DHCP Client service was successfully sent a start control. ... "Meinolf Weber" wrote: ... I do not intend to change DNS or DHCP servers. ...
    (microsoft.public.windows.server.general)
  • Re: DHCP
    ... to be registered and renewed on a private network? ... DHCP client service is needed for registration and renewal ... I have 3 DNS servers running Windows 2000 Server. ...
    (microsoft.public.windows.server.general)