Network slows down then stops. Plz help me!!!

Network slows down then stops. Plz help me!!!

Post by Pwel Mast » Fri, 16 Jun 2000 04:00:00



Yello,
I currently have a RH 6.0 server with 2 NIC cards : one on a local
network and the other hooked up to a cable modem.  I'm running IP
masquerading some my local network can have access to the net.

Everything runs fine for a couple of days.  After about 5 days, we
notice that on _some_ machines of the local net, access to the
Internet slows down and then stops working (after about 1 day of slow
connection).  About one day later, even the servers connection to the
net stops working (on the cable modem connection).  A network restart
fixes the problem, but only temporarily.  The only thing that works is
a complete reboot of the server.

I looked at ifconfig's info and there are no errors.  I tcpdumped both
interfaces to see where the traffic was being blocked and it seems
that the packets are going out, but when they come back, they don't
seem to be able to _all_ go through the cable modem connection.  When
this happens, ping works fine (packets are going in and out no prob).
Also, memory usage seems normal (no leaks).  
 I'm clueless!

Here is a little info on the server:
P133 64 megs RAM
Inet services: telnet, ftp, cvs, pop2 and pop3.
Server also running sendmail, inn, ypserv, httpd, mysql and samba.
eth0 : local net interface 10.10.10.1/255.255.255.0 (always works
fine)
eth1 : cable modem, DHCP server at my ISP

Any clues?

         Thanks,
                Phil

 
 
 

Network slows down then stops. Plz help me!!!

Post by Michael Mensc » Fri, 16 Jun 2000 04:00:00


I have a similar problem.
I'm running RH6.2 server and two winblows boxes thru the server.
and every so often my connection to the internet stops(or gets really
slow)
i found that if i unplug my cable modem then plug it back in the network
comes back.
i looked through my firewall logs for the time that the network stopped
(i was on one of the times)  and found last IP address that was logged.

so i think it's some thing they are doing to throttle down the speed.
(or stop you if they think you are using to much)

i hooked an X10 module to the cable modem power.
next i'm going to have the linux server automatically cycle the power to
the modem
when it loses connection to the internet.

hope this helps

mike


> Yello,
> I currently have a RH 6.0 server with 2 NIC cards : one on a local
> network and the other hooked up to a cable modem.  I'm running IP
> masquerading some my local network can have access to the net.

> Everything runs fine for a couple of days.  After about 5 days, we
> notice that on _some_ machines of the local net, access to the
> Internet slows down and then stops working (after about 1 day of slow
> connection).  About one day later, even the servers connection to the
> net stops working (on the cable modem connection).  A network restart
> fixes the problem, but only temporarily.  The only thing that works is
> a complete reboot of the server.

> I looked at ifconfig's info and there are no errors.  I tcpdumped both
> interfaces to see where the traffic was being blocked and it seems
> that the packets are going out, but when they come back, they don't
> seem to be able to _all_ go through the cable modem connection.  When
> this happens, ping works fine (packets are going in and out no prob).
> Also, memory usage seems normal (no leaks).
>  I'm clueless!

> Here is a little info on the server:
> P133 64 megs RAM
> Inet services: telnet, ftp, cvs, pop2 and pop3.
> Server also running sendmail, inn, ypserv, httpd, mysql and samba.
> eth0 : local net interface 10.10.10.1/255.255.255.0 (always works
> fine)
> eth1 : cable modem, DHCP server at my ISP

> Any clues?

>          Thanks,
>                 Phil


 
 
 

1. plz plz plz help.

it seems that i cannot get my eth0 to come up on my laptop. after reviewing
the boot log i can see that my pcmcia services are working fine and the
correct driver is installed

here is a snip of the boot log

Dec 28 16:11:03 c1319937-a pcmcia: Starting PCMCIA services:
Dec 28 16:11:03 c1319937-a pcmcia:  modules
Dec 28 16:11:03 c1319937-a kernel: Linux PCMCIA Card Services 3.1.19
Dec 28 16:11:03 c1319937-a kernel:   kernel build: 2.2.16-22 #1 Tue Aug 22
16:49:06 EDT 2000
Dec 28 16:11:03 c1319937-a kernel:   options:  [pci] [cardbus] [apm]
Dec 28 16:11:03 c1319937-a kernel: PCI routing table version 1.0 at 0xfbda0
Dec 28 16:11:03 c1319937-a kernel:   00:03.0 -> irq 11
Dec 28 16:11:03 c1319937-a kernel:   00:03.1 -> irq 11
Dec 28 16:11:03 c1319937-a kernel: Intel PCIC probe:
Dec 28 16:11:03 c1319937-a kernel:   TI 1225 rev 01 PCI-to-CardBus at slot
00:03, mem 0x68000000
Dec 28 16:11:03 c1319937-a kernel:     host opts [0]: [ring] [serial pci &
irq] [pci irq 11] [lat 32/32] [bus 32/34]
Dec 28 16:11:03 c1319937-a kernel:     host opts [1]: [ring] [serial pci &
irq] [pci irq 11] [lat 32/32] [bus 35/37]
Dec 28 16:11:03 c1319937-a kernel:     ISA irqs (scanned) = 3,4,7,9,10 PCI
status changes
Dec 28 16:11:03 c1319937-a pcmcia:  cardmgr.
Dec 28 16:11:03 c1319937-a rc: Starting pcmcia:  succeeded
Dec 28 16:11:03 c1319937-a cardmgr[468]: starting, version is 3.1.19
Dec 28 16:11:04 c1319937-a cardmgr[468]: watching 2 sockets
Dec 28 16:11:04 c1319937-a kernel: cs: IO port probe 0x0c00-0x0cff:
excluding 0xcf8-0xcff
Dec 28 16:11:04 c1319937-a kernel: cs: IO port probe 0x0800-0x08ff:
excluding 0x800-0x84f
Dec 28 16:11:04 c1319937-a kernel: cs: IO port probe 0x0100-0x04ff:
excluding 0x280-0x287 0x378-0x37f 0x4d0-0x4d7
Dec 28 16:11:04 c1319937-a kernel: cs: IO port probe 0x0a00-0x0aff: clean.
Dec 28 16:11:04 c1319937-a cardmgr[468]: initializing socket 0
Dec 28 16:11:04 c1319937-a kernel: cs: memory probe 0xa0000000-0xa0ffffff:
clean.
Dec 28 16:11:04 c1319937-a cardmgr[468]: socket 0: 3Com 589 Ethernet
Dec 28 16:11:04 c1319937-a cardmgr[468]: executing: 'modprobe 3c589_cs'
Dec 28 16:11:04 c1319937-a kernel: eth0: 3Com 3c589, io 0x300, irq 3,
hw_addr 00:60:97:CC:CA:9A
Dec 28 16:11:04 c1319937-a kernel:   8K FIFO split 5:3 Rx:Tx, auto xcvr
Dec 28 16:11:04 c1319937-a cardmgr[468]: executing: './network start eth0'
Dec 28 16:11:05 c1319937-a checkpc[480]: Get_local_host: hostname
'c1319937-a.grlnd1.tx.home.com' bad
Dec 28 16:11:05 c1319937-a pumpd[509]: starting at (uptime 0 days, 0:00:41)
Thu Dec 28 16:11:05 2000
Dec 28 16:11:05 c1319937-a lpd[514]: Get_local_host: hostname
'c1319937-a.grlnd1.tx.home.com' bad
Dec 28 16:11:05 c1319937-a lpd: 2000-12-28-16:11:05.467 Get_local_host:
hostname 'c1319937-a.grlnd1.tx.home.com' bad

plz help me with this prob.
many thanks.

2. robust methods for bullet proofing ftp script w/ lots of err checking - can use expect, ksh, perl ...about transfer via network

3. NFS: When one server goes down, entire network slows down to a crawl.

4. Incomplete output from crontab email: running shell scripts from a perl script

5. HELP: Collisions slowing down network to Linux file server

6. Help: Linux client access to Sparc Oracle 7

7. HELP!! network slow down suddenly...

8. XF86Config for Dell Inspiron 7500?

9. HELP: Network collisions slowing down connection to Linux file server

10. HELP: occasional network slow down and no connection

11. shut down problems help plz

12. Linux box slowing down my network.

13. Network slowed down because of cable? HALP!