strange (non-knoppix) networking problem (need help)

[SillyFly]

hi.
lately I've been having strange problems on my internet connection.
whenever I try to access a web site, I get "server timeout", and I have to reload for the page to load. this happnes regardless of what browser I use, and at any time of the day.
also, FTP connections hang on entering passive mode.
this isn't hardware problem, because on the same computer, running Knoppix, these problems are gone.
also, this isn't network problems, as other nodes on the same network don't have there problems either.

these got me to the conclusion that it has something to do with my settings, but I don't know what to look for...
my comp is an amd 700, with 256MB ram. it is connected to a win2k comp running dhcp (the win2k is connected to the internet, and is serving as my default gateway).
no firewall is running on either comp.

any clue?

[turbine]

Try pinging the win2k server box to see if you see any problems there. I have a very similar setup to yours, my win2k is connected to the net via dsl on usb. Every now and then I have to reset the dsl box and reboot the win2k machine to clear up problems like you're describing. Difference is that when I have a problem on one box on my lan they all have same problem. Ping the win2k from the problem machine and then ping from one of the good machines and see if there are large differences such as in response times. Start there.

[gowator]

try

route -a

and

ifconfig -a and post back!
[/code]

[SillyFly]

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.0.0 * 255.255.255.0 U 0 0 0 eth0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default 192.168.0.1 0.0.0.0 UG 0 0 0 eth0

this is the output of "route". route -a says "no such option -a"



eth0 Link encap:Ethernet HWaddr 52:54:00:DA:63:33
inet addr:192.168.0.3 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3844 errors:0 dropped:0 overruns:0 frame:0
TX packets:3939 errors:0 dropped:0 overruns:0 carrier:0
collisions:9 txqueuelen:100
RX bytes:2618257 (2.4 Mb) TX bytes:1121818 (1.0 Mb)
Interrupt:11 Base address:0xe800

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:300 errors:0 dropped:0 overruns:0 frame:0
TX packets:300 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:20184 (19.7 Kb) TX bytes:20184 (19.7 Kb)



and that was ifconfig -a

pinging the w2k machine (192.168.0.1) goes well, and so does traceroutes :


PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=1 ttl=128 time=0.498 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=128 time=0.511 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=128 time=0.512 ms
64 bytes from 192.168.0.1: icmp_seq=4 ttl=128 time=0.504 ms

--- 192.168.0.1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3003ms
rtt min/avg/max/mdev = 0.498/0.506/0.512/0.016 ms



traceroute to knoppix.net (66.220.1.171), 30 hops max, 38 byte packets
1 192.168.0.1 (192.168.0.1) 1.437 ms 0.724 ms 0.449 ms
2 10.243.64.1 (10.243.64.1) 7.315 ms 15.649 ms 5.889 ms
3 172.18.12.13 (172.18.12.13) 13.920 ms 10.461 ms 29.001 ms
4 172.17.0.141 (172.17.0.141) 9.810 ms * 13.180 ms
5 172.17.0.53 (172.17.0.53) 10.715 ms 10.767 ms 10.154 ms
6 172.18.0.10 (172.18.0.10) 12.693 ms 12.923 ms 10.833 ms
7 pal6-goldenlines-1-il.seabone.net (195.22.196.193) 39.198 ms 37.647 ms 38.858 ms
8 linx-lon1-racc1.lon.seabone.net (195.22.209.109) 85.275 ms 85.358 ms 86.012 ms
9 gsr12012.lon.he.net (195.66.224.21) 84.928 ms 83.456 ms 82.956 ms
10 pos8-0.br1.nyc.he.net (216.218.200.101) 173.409 ms 161.444 ms 160.105 ms
11 pos2-1.gsr12012.chi.he.net (64.71.157.62) 182.580 ms 181.442 ms 181.900 ms
12 pos1-0.gsr12012.sjc.he.net (64.62.227.53) 312.851 ms 303.247 ms 305.928 ms
13 pos1-2.gsr12416.fmt.he.net (64.71.128.182) 301.939 ms 303.371 ms 303.162 ms
14 pos10-0.gsr12012.fmt.he.net (216.218.193.134) 234.412 ms 233.764 ms *
15 knoppix.net (66.220.1.171) 236.758 ms 236.599 ms 238.399 ms




PING knoppix.net (66.220.1.171) 56(84) bytes of data.
64 bytes from knoppix.net (66.220.1.171): icmp_seq=1 ttl=52 time=252 ms
64 bytes from knoppix.net (66.220.1.171): icmp_seq=2 ttl=52 time=244 ms
64 bytes from knoppix.net (66.220.1.171): icmp_seq=3 ttl=52 time=240 ms
64 bytes from knoppix.net (66.220.1.171): icmp_seq=4 ttl=52 time=240 ms

--- knoppix.net ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3026ms
rtt min/avg/max/mdev = 240.414/244.472/252.442/4.929 ms


i have this problem for several weeks now, and both the w2k machine and it's attached cable modem (Ambit) where restarted several times since.[/code]

[turbine]

SillyFly, those ping times look awfully excessive to me. One half second to ping 64 bytes on a 100 mbit/sec, or even a 10 mbit/sec lan seems VERY slow. This may be pointing to the problem. Have you tried pinging the w2k box from another windows box just to get a comparison? Is this knoppix box a dual boot system? If so, try bringing up the other os and doing the pinging. If the times are as slow as the ones on the knoppix then I'd start to look at the lan card itself.

[turbine]

Whoops! Belay that last post. I misread those times on the pings. Still, 3 seconds for 4 packets seems high. Your lan card could be doing a lot of retransmissions. Problem could be there.

[SillyFly]

the 3 secs total time is because ping waits 1 second between the packets.
anyway, this box isn't running Knoppix (as the title says), but Mandrake.
when booting Knoppix it is all fine, which is why I concluded it is not a hardware problem, nor a link problem, but something must have gone wrong in my configuration, I just can't figure out what :(

[SillyFly]

to conclude this thread -
the problem is now solved, after I have moved the cable connection from the W2K comp. to a different computer, running Windows 2003 server.

this got me to the inevitable conclusion that something went wrong with the w2k settings, and not my Linux settings.

thanks to everyone who tried to help.