Re: Wierdness with Internet

[Jim Shepherd]

I possibly have the same problem.  I installed Fedora Core 2 Test 1 and
had no problems with network connectivity, even after running yum
several times to update the packages.  Today, I updated again and now I
can only access internet sites on the other side of my home router
(Wireless Linksys) by using the actual IP address, name resolution
fails.  My other computer on the home network running RedHat 9 still has
full network connectivity.

I also tried disabling ECN:  I logged in as root, typed:

echo 0 > /proc/sys/net/ipv4/tcp_ecn

and still had the same problems.  I even restarting network services
after disabling ECN without success.  I also checked resolv.conf and it
is the same as the RedHat 9 computer.  Any ideas?

-Jim

Wierdness with Internet

[Steve Bergman]

FWIW, both site's mentioned in Eric's post fail to load for me when ECN 
is on, but load immediately when ECN is off.  You also mention the magic 
word: "Linksys" which seems more or less synonymous with "ECN 
problems".  I can't help but feel that where there's smoke, there's
fire.

Wierdness with Internet

[Jim Shepherd]

On Tue, 2004-02-24 at 22:55 -0600, Steve Bergman wrote:
>  FWIW, both site's mentioned in Eric's post fail to load for
> me when ECN 
>  is on, but load immediately when ECN is off.  You also mention the magic 
>  word: "Linksys" which seems more or less synonymous with "ECN 
>  problems".  I can't help but feel that where there's smoke, there's
> fire.
>   
Well, I tried disabling ECN without success.  Is there something else I
have to do besides entering the command:

echo 0 > /proc/sys/net/ipv4/tcp_ecn

I have verified that the file is set to 0 using cat and have also
restarted the network services.  Is there something else I need to do?

-Jim

Wierdness with Internet

[Steve Bergman]

No.  I think you have done what you can.  Where is your DNS server?  Is 
it on your LAN or is it on the other side of your router?

As it happens, I am running the -81 kernel myself, due to problems that 
the later kernels have with reiserfs and shmat.

I'll test with -100 and see what happens with Eric's sites.

-Steve

Wierdness with Internet

[Jim Shepherd]

On Tue, 2004-02-24 at 23:13 -0600, Steve Bergman wrote:
>  No.  I think you have done what you can.  Where is your DNS server? 
> Is 
>  it on your LAN or is it on the other side of your router? 
The DNS is on the other side of the router.

-Jim

Wierdness with Internet

[Steve Bergman]

Jim Shepherd wrote:

> On Tue, 2004-02-24 at 23:13 -0600, Steve Bergman wrote:
>   
>
> >No.  I think you have done what you can.  Where is your DNS server?  Is 
> >it on your LAN or is it on the other side of your router?
> >    
> >
>
> The DNS is on the other side of the router.
>
> -Jim
>
>
>   
>  
Hmm.  What happens if you:

# up2date bind caching-nameserver
# service start named

and then set the DNS server to 127.0.0.1?

Just fishing for more info.

-Steve

Wierdness with Internet

[Jim Shepherd]

On Tue, 2004-02-24 at 23:31 -0600, Steve Bergman wrote:
>  Hmm.  What happens if you:
>  
>  # up2date bind caching-nameserver
>  # service start named
>  
>  and then set the DNS server to 127.0.0.1? 
Updated bind and the caching-nameserver, started named (using the init.d
script), and changed resolv.conf so it the nameserver 127.0.0.1 line
first and then only that line.  Still unable to resolve hostnames from
the remote DNS.

-Jim

Wierdness with Internet

[Jim Shepherd]

On Tue, 2004-02-24 at 22:55 -0600, Steve Bergman wrote:
>  FWIW, both site's mentioned in Eric's post fail to load for
> me when ECN 
>  is on, but load immediately when ECN is off.  You also mention the magic 
>  word: "Linksys" which seems more or less synonymous with "ECN 
>  problems".  I can't help but feel that where there's smoke, there's
> fire.
>  
>   
One other data point.  Right now, everything works well with 2.6.3-1.81
and ECN enabled (tcp_ecn is set to 1).  But with 2.6.3-1.96 and 2.6.3-
1.100 internet connectivity does not work with ECN enabled or disabled
(assuming I am actually disabling ECN correctly).

-Jim

-Jim

Wierdness with Internet

[Steve Bergman]

Well, with the -100 kernel I have exactly the same results.  With ECN on 
there are problems loading Eric's sites.  With ECN off, it works.  I was 
thinking that perhaps there was a problem turning ECN off in later 
kernels.  Apparently not.

-Steve

Wierdness with Internet

[Kaj J.Niemi]

>  FWIW, both site's mentioned in Eric's post fail to load for
> me when ECN
>  is on, but load immediately when ECN is off.  You also mention the magic
>  word: "Linksys" which seems more or less synonymous with "ECN
>  problems".  I can't help but feel that where there's smoke, there's
> fire. 
Both sites work fine with ECN enabled. Most likely the problem is something
else.



// kaj

Wierdness with Internet

[Jim Shepherd]

On Tue, 2004-02-24 at 23:39 -0500, Jim Shepherd wrote:
>  I possibly have the same problem.  I installed Fedora Core 2 Test 1
> and
>  had no problems with network connectivity, even after running yum
>  several times to update the packages.  Today, I updated again and now I
>  can only access internet sites on the other side of my home router
>  (Wireless Linksys) by using the actual IP address, name resolution
>  fails.  My other computer on the home network running RedHat 9 still has
>  full network connectivity.
>  
>  I also tried disabling ECN:  I logged in as root, typed:
>  
>  echo 0 > /proc/sys/net/ipv4/tcp_ecn
>  
>  and still had the same problems.  I even restarting network services
>  after disabling ECN without success.  I also checked resolv.conf and it
>  is the same as the RedHat 9 computer.  Any ideas?
>  
>  -Jim
>   
More information... I downgraded to kernel 2.6.3-1.81 and now the
internet connectivity is operational again.  I also tried 2.6.3-1.96 and
it had the same name resolution problems as 2.6.3-1.100 which is the
latest version I have installed.

-Jim