[gentoo-user] HELP! Network status changes randomly, how to diagnose?

[gentoo-user] HELP! Network status changes randomly, how to diagnose?

[Erik]

I am trying to connect my Gentoo computer to my D-Link DVG-1120 (VoIP 
Gateway with NAT) again after 3 months. It used to work great, but now 
the network status is changing randomly. Sometimes I can load a webpage, 
but then when I click on a link I get an error message. Then it may 
suddenly work again. The Internet connection to the gateway works fine 
and I can make phonecalls with the phones that are connected to it. It 
is the link to the computer that is broken. The computer works when 
connected directly to the internet and the cable works perfectly too 
(tested elsewhere). I see that it is changing randomly by executing the 
command
    ifconfig eth0|grep "inet addr:"
repeateldy. Sometimes I get nothing, sometimes I get:
          inet addr:192.168.0.46  Bcast:192.168.0.255  Mask:255.255.255.0
It looks random. What can I do about it? Is there some software for 
analyzing it?

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[gentoo-user] HELP! Network status changes randomly, how to diagnose?

[Erik]

I am trying to connect my Gentoo computer to my D-Link DVG-1120 (VoIP
Gateway with NAT) again after 3 months. It used to work great, but now
the network status is changing randomly. Sometimes I can load a webpage,
but then when I click on a link I get an error message. Then it may
suddenly work again. The Internet connection to the gateway works fine
and I can make phonecalls with the phones that are connected to it. It
is the link to the computer that is broken. The computer works when
connected directly to the internet and the cable works perfectly too
(tested elsewhere). I see that it is changing randomly by executing the
command
    ifconfig eth0|grep "inet addr:"
repeateldy. Sometimes I get nothing, sometimes I get:
          inet addr:192.168.0.46  Bcast:192.168.0.255  Mask:255.255.255.0
It looks random. What can I do about it? Is there some software for
analyzing it?


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[gentoo-user] HELP! Network status changes randomly, how to diagnose?

[Erik]

I am trying to connect my Gentoo computer to my D-Link DVG-1120 (VoIP
Gateway with NAT) again after 3 months. It used to work great, but now
the network status is changing randomly. Sometimes I can load a webpage,
but then when I click on a link I get an error message. Then it may
suddenly work again. The Internet connection to the gateway works fine
and I can make phonecalls with the phones that are connected to it. It
is the link to the computer that is broken. The computer works when
connected directly to the internet and the cable works perfectly too
(tested elsewhere). I see that it is changing randomly by executing the
command
    ifconfig eth0|grep "inet addr:"
repeateldy. Sometimes I get nothing, sometimes I get:
          inet addr:192.168.0.46  Bcast:192.168.0.255  Mask:255.255.255.0
It looks random. What can I do about it? Is there some software for
analyzing it?



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Re: [gentoo-user] HELP! Network status changes randomly, how to diagnose?

[Frank Jahn]

Erik schrieb:
> I am trying to connect my Gentoo computer to my D-Link DVG-1120 (VoIP
> Gateway with NAT) again after 3 months. It used to work great, but now
> the network status is changing randomly. Sometimes I can load a webpage,
> but then when I click on a link I get an error message. Then it may
> suddenly work again. The Internet connection to the gateway works fine
> and I can make phonecalls with the phones that are connected to it. It
> is the link to the computer that is broken. The computer works when
> connected directly to the internet and the cable works perfectly too
> (tested elsewhere). I see that it is changing randomly by executing the
> command
>    ifconfig eth0|grep "inet addr:"
> repeateldy. Sometimes I get nothing, sometimes I get:
>          inet addr:192.168.0.46  Bcast:192.168.0.255  Mask:255.255.255.0
> It looks random. What can I do about it? Is there some software for
> analyzing it?
>
>
>
could you post your config please?

regards
Frank
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Re: [gentoo-user] HELP! Network status changes randomly, how to diagnose?

[Neil Bothwick]

[-- Attachment #1: Type: text/plain, Size: 388 bytes --]

Posting the same question three times in one day is likely to increase
the number of responses you get, but only from people complaining about
your repeated posting.


-- 
Neil Bothwick

NOTE: The most fundamental particles in your computer are held together
by a "glueing" force about which little is known and whose adhesive power
cannot therefore be permanently guaranteed.

[-- Attachment #2: signature.asc --]
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Re: [gentoo-user] HELP! Network status changes randomly, how to diagnose?

[Roman Zilka]

Sounds like you might've been trojaned in some weird way. Do you update
regularly? If you run out of options, maybe a complete reinstall (to be sure)
would be in place.

Is there nothing unusual in the logs?

-rz
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Re: [gentoo-user] HELP! Network status changes randomly, how to diagnose?

[Erik]

Frank Jahn wrote:
> Erik schrieb:
>> I am trying to connect my Gentoo computer to my D-Link DVG-1120 (VoIP
>> Gateway with NAT) again after 3 months. It used to work great, but now
>> the network status is changing randomly. Sometimes I can load a webpage,
>> but then when I click on a link I get an error message. Then it may
>> suddenly work again. The Internet connection to the gateway works fine
>> and I can make phonecalls with the phones that are connected to it. It
>> is the link to the computer that is broken. The computer works when
>> connected directly to the internet and the cable works perfectly too
>> (tested elsewhere). I see that it is changing randomly by executing the
>> command
>>    ifconfig eth0|grep "inet addr:"
>> repeateldy. Sometimes I get nothing, sometimes I get:
>>          inet addr:192.168.0.46  Bcast:192.168.0.255  Mask:255.255.255.0
>> It looks random. What can I do about it? Is there some software for
>> analyzing it?
> could you post your config please?
Thanks for your answer. Here is some configuration:
=================================================
# cat /etc/modules.autoload.d/kernel-2.6|grep -E "(b44|ipw2100)"
b44
ipw2100
# lsmod|grep -E "(b44|ipw2100)"
b44                    18636  0
ipw2100                71028  0
ieee80211              26184  1 ipw2100
firmware_class          6976  1 ipw2100
# cat /etc/modules.d/b44
alias eth0 b44
# cat /etc/modules.d/ipw2100
alias eth1 ipw2100
# ls -l /etc/conf.d/net* /etc/init.d/net*
-rw-r--r-- 1 root root 32176 28 aug 20.43 /etc/conf.d/net.example
lrwxrwxrwx 1 root root     6 28 aug 20.43 /etc/init.d/net.eth0 -> net.lo
lrwxrwxrwx 1 root root     6 18 feb  2006 /etc/init.d/net.eth1 -> net.lo
-rwxr-xr-x 1 root root 30045 28 aug 20.43 /etc/init.d/net.lo
-rwxr-xr-x 1 root root  3046 28 aug 20.43 /etc/init.d/netmount
# ps aux|grep -E "(ifplug|dhcp|eth)"
root      1010  0.0  0.0   1472   428 ?        Ss   16:27   0:00 
/usr/sbin/ifplugd --iface=eth0
root      1530  0.0  0.0   1600   228 ?        Ss   16:28   0:00 
/sbin/dhcpcd -h c213-100-41-30.swipnet.se eth0
root      1980  0.0  0.0   1780   652 pts/1    R+   17:03   0:00 grep -E 
(ifplug|dhcp|eth)
# rc-update show
               acpid |      default
           alsasound |      default
            bootmisc | boot
             checkfs | boot
           checkroot | boot
               clock | boot
         consolefont | boot
             cpufreq | boot
                 gpm | boot
              hdparm | boot
            hostname | boot
             hotplug | boot
             kbdrate | boot
             keymaps | boot
               local |      default nonetwork
          localmount | boot
             modules | boot
              net.lo | boot
            netmount |      default
             postfix |      default
               power |      default
           rmnologin | boot
           syslog-ng |      default
             urandom | boot
                 xdm |      default
# emerge -pv baselayout net-tools iproute2

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R   ] sys-apps/baselayout-1.12.4-r7  USE="unicode -bootstrap 
-build -static" 0 kB
[ebuild   R   ] sys-apps/net-tools-1.60-r11  USE="nls -static" 0 kB
[ebuild   R   ] sys-apps/iproute2-2.6.15.20060110  USE="berkdb -atm 
-minimal" 0 kB

Total size of downloads: 0 kB
=================================================


What does this mean?:
# /etc/init.d/net.eth0 start
 * Service net.eth0 starting
 * WARNING:  net.eth0 has started but is inactive

I made this script to test how often it fails. It checks ifconfig 10 000 
times and reports how many times it did NOT have an address:
#! /bin/bash
export I=0
export FAILURES=0
while test $I -lt 10000; do
    export I=$(dc -e "$I 1 + p");
    export FAILURES=$(dc -e "$FAILURES $(ifconfig eth0|grep "inet 
addr:">/dev/null; echo $?) + p");
    done
echo FAILURES=$FAILURES


When I run it I get:
FAILURES=9786
FAILURES=9787
FAILURES=9779
(numbers vary somewhat between runs)

Running the script with the computer connected directly to the Internet 
gives:
FAILURES=0

What else should I do?
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Re: [gentoo-user] HELP! Network status changes randomly, how to diagnose?

[Erik]

Erik wrote:
> Frank Jahn wrote:
>> Erik schrieb:
>>> I am trying to connect my Gentoo computer to my D-Link DVG-1120 (VoIP
>>> Gateway with NAT) again after 3 months. It used to work great, but now
>>> the network status is changing randomly. Sometimes I can load a 
>>> webpage,
>>> but then when I click on a link I get an error message. Then it may
>>> suddenly work again. The Internet connection to the gateway works fine
>>> and I can make phonecalls with the phones that are connected to it. It
>>> is the link to the computer that is broken. The computer works when
>>> connected directly to the internet and the cable works perfectly too
>>> (tested elsewhere). I see that it is changing randomly by executing the
>>> command
>>>    ifconfig eth0|grep "inet addr:"
>>> repeateldy. Sometimes I get nothing, sometimes I get:
>>>          inet addr:192.168.0.46  Bcast:192.168.0.255  
>>> Mask:255.255.255.0
>>> It looks random. What can I do about it? Is there some software for
>>> analyzing it?
>> could you post your config please?
> Thanks for your answer. Here is some configuration:
> =================================================
> # cat /etc/modules.autoload.d/kernel-2.6|grep -E "(b44|ipw2100)"
> b44
> ipw2100
> # lsmod|grep -E "(b44|ipw2100)"
> b44                    18636  0
> ipw2100                71028  0
> ieee80211              26184  1 ipw2100
> firmware_class          6976  1 ipw2100
> # cat /etc/modules.d/b44
> alias eth0 b44
> # cat /etc/modules.d/ipw2100
> alias eth1 ipw2100
> # ls -l /etc/conf.d/net* /etc/init.d/net*
> -rw-r--r-- 1 root root 32176 28 aug 20.43 /etc/conf.d/net.example
> lrwxrwxrwx 1 root root     6 28 aug 20.43 /etc/init.d/net.eth0 -> net.lo
> lrwxrwxrwx 1 root root     6 18 feb  2006 /etc/init.d/net.eth1 -> net.lo
> -rwxr-xr-x 1 root root 30045 28 aug 20.43 /etc/init.d/net.lo
> -rwxr-xr-x 1 root root  3046 28 aug 20.43 /etc/init.d/netmount
> # ps aux|grep -E "(ifplug|dhcp|eth)"
> root      1010  0.0  0.0   1472   428 ?        Ss   16:27   0:00 
> /usr/sbin/ifplugd --iface=eth0
> root      1530  0.0  0.0   1600   228 ?        Ss   16:28   0:00 
> /sbin/dhcpcd -h c213-100-41-30.swipnet.se eth0
> root      1980  0.0  0.0   1780   652 pts/1    R+   17:03   0:00 grep 
> -E (ifplug|dhcp|eth)
> # rc-update show
>               acpid |      default
>           alsasound |      default
>            bootmisc | boot
>             checkfs | boot
>           checkroot | boot
>               clock | boot
>         consolefont | boot
>             cpufreq | boot
>                 gpm | boot
>              hdparm | boot
>            hostname | boot
>             hotplug | boot
>             kbdrate | boot
>             keymaps | boot
>               local |      default nonetwork
>          localmount | boot
>             modules | boot
>              net.lo | boot
>            netmount |      default
>             postfix |      default
>               power |      default
>           rmnologin | boot
>           syslog-ng |      default
>             urandom | boot
>                 xdm |      default
> # emerge -pv baselayout net-tools iproute2
>
> These are the packages that would be merged, in order:
>
> Calculating dependencies... done!
> [ebuild   R   ] sys-apps/baselayout-1.12.4-r7  USE="unicode -bootstrap 
> -build -static" 0 kB
> [ebuild   R   ] sys-apps/net-tools-1.60-r11  USE="nls -static" 0 kB
> [ebuild   R   ] sys-apps/iproute2-2.6.15.20060110  USE="berkdb -atm 
> -minimal" 0 kB
>
> Total size of downloads: 0 kB
> =================================================
>
>
> What does this mean?:
> # /etc/init.d/net.eth0 start
> * Service net.eth0 starting
> * WARNING:  net.eth0 has started but is inactive
>
> I made this script to test how often it fails. It checks ifconfig 10 
> 000 times and reports how many times it did NOT have an address:
> #! /bin/bash
> export I=0
> export FAILURES=0
> while test $I -lt 10000; do
>    export I=$(dc -e "$I 1 + p");
>    export FAILURES=$(dc -e "$FAILURES $(ifconfig eth0|grep "inet 
> addr:">/dev/null; echo $?) + p");
>    done
> echo FAILURES=$FAILURES
>
>
> When I run it I get:
> FAILURES=9786
> FAILURES=9787
> FAILURES=9779
> (numbers vary somewhat between runs)
>
> Running the script with the computer connected directly to the 
> Internet gives:
> FAILURES=0
>
> What else should I do?
I have narrowed down the problem further. I am now connected with a 
static IP address and it works just fine.

# grep "^[^#]" /etc/conf.d/net.eth0
config_eth0=( "192.168.0.16 netmask 255.255.255.0 broadcast 192.168.0.255" )
routes_eth0=(
        "default via 192.168.0.1"               # IPv4 default route
)


So I guess it must be the DHCP client on the computer that fails somehow.
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Re: [gentoo-user] HELP! Network status changes randomly, how to diagnose?

[Mick]

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On Thursday 31 August 2006 22:04, Erik wrote:

> I have narrowed down the problem further. I am now connected with a
> static IP address and it works just fine.

I guess, there must be a setting in sysctl or some config file which sets how 
often an IP address is renewed.  Did you interefere with it by any chance?
-- 
Regards,
Mick

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Re: [gentoo-user] HELP! Network status changes randomly, how to diagnose?

[Erik]

Mick wrote:
> On Thursday 31 August 2006 22:04, Erik wrote:
>   
>> I have narrowed down the problem further. I am now connected with a
>> static IP address and it works just fine.
>>     
> I guess, there must be a setting in sysctl or some config file which sets how 
> often an IP address is renewed.  Did you interefere with it by any chance?
>   
Not that I know.
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