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Old 04-24-2004, 01:31 PM   #1
The Last Grok
LQ Newbie
 
Registered: Apr 2004
Distribution: SuSE 9.0
Posts: 10

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Sluggish Network, Computer Slowdown


Hello,

Given the nature of this site, it is not entirely unreasonable to assume that I was wondering whether anybody could help me. I'm running SuSE 9.0 on an IBM Thinkpad (T30) notebook. I use this laptop mostly in two locations, each with its own network. In one location, the network functions properly and Linux runs great. (This should be noted, as it means that there's nothing wrong with the general Linux configuration.) In the other, things are not quite as bright. When plugged into LAN, it takes the computer ages (far beyond anything reasonable, especially when compared with the same computer in the first location) to boot, as well as to load programs. The network connection, while available, is incomprehensibly slow. (It is somewhat odd, as, while appearing to take ages to establish a connection, I have been successful in obtaining a semi-reasonable speed while downloading large – several megabytes’ worth – batches of information.) When using a Wi-Fi PCMCIA card (Linksys Instant Wireless Network PC Card, ver. 3), the computer has problems loading programs (although not nearly as severe as when connected via LAN), and experiences the same problems as with a LAN connection - it took me 42 seconds to ping Google thrice.

My network topology is as follows:
* An ADSL modem, connected to a:
** D-Link DI-804 router (it is probably here that the problem lies), connected to:
*** A Linksys Wireless Network Access Point, by which I obtain wireless connectivity
*** Another WLAN access point, of different manufacture, which is irrelevant
*** A 3COM OfficeConnect Dual Speed Hub 8, by which I obtain LAN access

Can anybody offer advice? (If more information is needed, let me know.)

My sincerest thanks in advance,

TL Grok
 
Old 04-24-2004, 02:22 PM   #2
fancypiper
LQ Guru
 
Registered: Feb 2003
Location: Sparta, NC USA
Distribution: Ubuntu 10.04
Posts: 5,141

Rep: Reputation: 58
Post /etc/hosts
Code:
# Duron 950 uilleann Fedora Core 1 /etc/hosts file:  This file describes a numbe#
127.0.0.1       uilleann        uilleann.phils  localhost
192.168.0.1     tinwhistle      tinwhistle.phils
192.168.0.2     uilleann        uilleann.phils
/etc/hostname
Code:
uilleann
and your /etc/resolv.conf file
Code:
domain infoave.net
nameserver 206.74.254.2
nameserver 204.116.57.2
Try changing these (rememember to make a backup of these files) an see if theat helps.
 
Old 04-24-2004, 04:09 PM   #3
The Last Grok
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Registered: Apr 2004
Distribution: SuSE 9.0
Posts: 10

Original Poster
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Thanks for your quick reply. Below are the contents of the requested files. Note that, being a newbie to a certain extent, I don't know how to edit these files. I found several tutorials online, but wouldn't know where to start.

/etc/hosts
Code:
#
# hosts         This file describes a number of hostname-to-address
#               mappings for the TCP/IP subsystem.  It is mostly
#               used at boot time, when no name servers are running.
#               On small systems, this file can be used instead of a
#               "named" name server.
# Syntax:
#
# IP-Address  Full-Qualified-Hostname  Short-Hostname
#

127.0.0.1	localhost

# special IPv6 addresses
::1             localhost ipv6-localhost ipv6-loopback

fe00::0         ipv6-localnet

ff00::0         ipv6-mcastprefix
ff02::1         ipv6-allnodes
ff02::2         ipv6-allrouters
ff02::3         ipv6-allhosts

127.0.0.2      	lapitai.local 	lapitai
/etc/HOSTNAME
Code:
lapitai.local
/etc/resolv.conf
Code:
### BEGIN INFO
#
# Modified_by:  dhcpcd
# Backup:       /etc/resolv.conf.saved.by.dhcpcd
# Process:      dhcpcd
# Process_id:   1371
# Script:       /sbin/modify_resolvconf
# Saveto:
# Info:         This is a temporary resolv.conf created by service dhcpcd.
#               The previous file has been saved and will be restored later.
#               
#               If you don't like your resolv.conf to be changed, you
#               can set MODIFY_{RESOLV,NAMED}_CONF_DYNAMICALLY=no. This
#               variables are placed in /etc/sysconfig/network/config.
#
#               You can also configure service dhcpcd not to modify it.
#
#               If you don't like dhcpcd to change your nameserver
#               settings
#               then either set DHCLIENT_MODIFY_RESOLV_CONF=no
#               in /etc/sysconfig/network/dhcp, or
#               set MODIFY_RESOLV_CONF_DYNAMICALLY=no in
#               /etc/sysconfig/network/config or (manually) use dhcpcd
#               with -R.  If you only want to keep your searchlist, set
#               DHCLIENT_KEEP_SEARCHLIST=yes in /etc/sysconfig/network/dhcp or
#               (manually) use the -K option.
#
### END INFO
search my.router
nameserver 192.168.0.1
nameserver 192.168.0.1
(One more thing: I have tried running Knoppix, whose hardware detection is far superior to SuSE's, but to no avail. I met with the exact same issues.)
 
Old 04-24-2004, 04:23 PM   #4
fancypiper
LQ Guru
 
Registered: Feb 2003
Location: Sparta, NC USA
Distribution: Ubuntu 10.04
Posts: 5,141

Rep: Reputation: 58
Common command line editors nano, pico, joe, ed, mcedit, emacs, your gui should have some text editors as well. My favorite is the editor built into Midnight Commander.

An Introduction to the Midnight Commander
Midnight Commander home page

I see you have two ethernets as well. You might try putting a/the name of the first ethernet card.

Last edited by fancypiper; 04-24-2004 at 10:09 PM.
 
Old 04-24-2004, 10:05 PM   #5
zaphodiv
Member
 
Registered: Oct 2003
Distribution: Slackware
Posts: 388

Rep: Reputation: 30
Use tcpdump or similar and see what it is going when it's going slow.

When you ping google, does it take a long time for each ping or does it pause for a long time while getting the ip address then ping at normal speed?
 
Old 04-25-2004, 07:04 AM   #6
The Last Grok
LQ Newbie
 
Registered: Apr 2004
Distribution: SuSE 9.0
Posts: 10

Original Poster
Rep: Reputation: 0
Each ping takes a lot of time, but no lost packets are reported. Furthermore, the software manages a DNS lookup fairly quickly.
Last night I toyed with the network some more. It really is odd - sometimes I could get pages to load at a decent rate (particularly when browsing within the same site), and sometimes the network failed entirely. As before, it would appear to be that once a download has been initiated it goes on rather well, but initiation is problematic. I have experienced problems with the same network when running Windows on the same computer (before I took the Linux plunge; I no longer have Windows on this computer), although mostly to a lesser extent, which makes one wonder. Anyway, I cannot at the moment modify the network configuration files (as per fancypiper's advice) nor run tcpdump (as suggested by zaphodiv), on account of presently being situated at the location of Network A, where all is well. I will be sure to update this thread when I return, several days hence, to the murky waters of Network B.
 
  


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