cannot access a site with kernel 2.6.7 or 2.6.8, 2.6.6 is ok

[Mick Mearns]

--- Alexander Apprich <a.apprich at science-computing.de> wrote:
> Mick Mearns wrote:
> > --- Daniel Lawson <daniel at wand.net.nz> wrote:
> > 
> >>>Only the 2.6.6 will access http://www.carsdirect.com/
> >>>The other two will just hang.
> >>>I used the same config file for each with a 'make oldconfig'
> >>>
> >>>I tried Firefox 0.9.1, 
> >>>Konqueror 3.2.2-4 (kde 3.2.2-6 Red Hat),
> >>>and Mozilla (no version available while running Firefox).
> >>>
> >>>I thought the site was down but accessed it from XP using Firefox
> >>
> >>0.9.1
> >>
> >>>Then I rebooted to the lowest kernel and it worked in Linux.
> >>>
> >>>
> >>>What in the kernel could posibly cause this with only this site?
> >>> 
> >>>
> >>
> >>Having ECN enabled can cause this. Some routers see the ECN bit and
> >>for 
> >>some unknown reason, drop packets with them enabled on the floor.
> >>
> >>cat /proc/sys/net/ipv4/tcp_ecn
> >>
> > 
> > 
> > [mick at athlon mick]$ su -
> > Password:
> > [root at athlon root]# cat /proc/sys/net/ipv4/tcp_ecn
> > 0
> > 
> > 
> > 
> >>If the result is 1, you have ECN enabled. If it's 0, you don't, 
> > 
> > 
> > Thanks for the reply;
> >   I am going to look at the .config files very carefully.
> > Although I doubt the problem is there.
> 
> Could be the IPv6!? I know there are some problems with browsers and
> IPv6. What does ifconfig and lsmod show? Is there any IPv6 ...
> 
> > 
> > Mick M.
> 
> Just a best guess ...
> 
> Alex
> 
Hello Alex;[mick at athlon mick]$ su -
Password:
[root at athlon root]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0E:A6:7C:13:61
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:319 errors:0 dropped:0 overruns:0 frame:0
          TX packets:367 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:276803 (270.3 Kb)  TX bytes:61546 (60.1 Kb)
          Interrupt:5 Memory:e0000000-0

eth1      Link encap:Ethernet  HWaddr 00:0E:A6:8B:DA:7D
          inet addr:198.162.1.55  Bcast:198.162.1.255 
Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:168 (168.0 b)
          Interrupt:5

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:50 errors:0 dropped:0 overruns:0 frame:0
          TX packets:50 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3296 (3.2 Kb)  TX bytes:3296 (3.2 Kb)

ppp0      Link encap:Point-to-Point Protocol
          inet addr:64.105.67.159  P-t-P:64.105.67.1 
Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1
          RX packets:296 errors:0 dropped:0 overruns:0 frame:0
          TX packets:341 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:268841 (262.5 Kb)  TX bytes:50947 (49.7 Kb)

[root at athlon root]# lsmod
Module                  Size  Used by
snd_pcm_oss            49192  0
snd_mixer_oss          17536  1 snd_pcm_oss
snd_intel8x0           29960  0
snd_ac97_codec         65924  1 snd_intel8x0
snd_pcm                85000  2 snd_pcm_oss,snd_intel8x0
snd_timer              21252  1 snd_pcm
snd_page_alloc          9096  2 snd_intel8x0,snd_pcm
snd_mpu401_uart         6400  1 snd_intel8x0
snd_rawmidi            20516  1 snd_mpu401_uart
snd_seq_device          6664  1 snd_rawmidi
snd                    46052  9
snd_pcm_oss,snd_mixer_oss,snd_intel8x0,snd_ac97_codec,snd_pcm,snd_timer,snd_mpu401_uart,snd_rawmidi,snd_seq_device
soundcore               7520  1 snd
sunrpc                130788  1
iptable_filter          2432  0
ip_tables              16256  1 iptable_filter
sg                     33440  0
nls_iso8859_1           3968  2
ohci_hcd               18692  0
ehci_hcd               28164  0
aic7xxx               162104  0
sd_mod                 17152  0
scsi_mod              104140  3 sg,aic7xxx,sd_mod
[root at athlon root]# uname -r
2.6.8-rc1

I don't see anything fishy here.

[root at athlon root]# cat /etc/modprobe.conf

alias eth0 sk98lin
alias eth1 forcedeth
alias scsi_hostadapter aic7xxx
alias snd-card-0 snd-intel8x0
install snd-intel8x0 /sbin/modprobe --ignore-install snd-intel8x0 &&
/usr/sbin/alsactl restore >/dev/null 2>&1 || :
remove snd-intel8x0 { /usr/sbin/alsactl store >/dev/null 2>&1 || : ; };
/sbin/modprobe -r --ignore-remove snd-intel8x0
alias usb-controller ehci-hcd
alias usb-controller1 ohci-hcd
alias net-pf-10 off

install ipv6 /bin/true

alias char-major-81 videodev
alias char-major-81-0 ivtv
options ivtv ivtv_debug=1
options tuner=2
options msp3400 once=1 simple=1

I added the "install ipv6 /bin/true" line some time ago.
Someone on the list had a different problem.

Mick



=====
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