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Old 02-21-2005, 09:39 PM   #1
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Registered: Jan 2005
Location: Milwaukee, Wisconsin
Distribution: Mandriva
Posts: 26

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Slow internet browsing


I'm having an issue with the internet. I have a 64bit AMD system running SuSE 9.2 64 bit, connected through a netgear router to a cable modem. I am experiencing extreemly slow internet browsing. For example I cannot use "YOU" because it quickly stalls. Download speeds start at 75kb/s then 65kb/s, 40kb/x, 15kb/s, and stalled.
I have read that there are a couple of solutions such as a command like:# etho echo 0 > /proc/sys/net/ipv4/tcp_default_win_scale
or by adding a line like: net.ipv4.tcp_default_win_scale = 0 to /etc/sysctl.conf. Or upgrading the kernel version.

I've tried and completed all of those options, with no success. I've also tried to figure out what upgrades to install from SuSE's ftp site with no luck, I don't know what to install or not to install based on just looking at the avaliable upgrades.

One thing that makes me question my set up is that when I go into Yast and select network cards then DSL connections, there is no DSL connection configured. Could this be my problem? And if so why am I able to access the net but just not be able to download successfuy?

Anyway I'm really lost and need advice. PLEASE.
Old 02-22-2005, 12:08 AM   #2
Registered: Feb 2005
Distribution: Slackware-current 64bit
Posts: 457

Rep: Reputation: 31
on SuSE 9.2 64-bit (cable + router) I am getting more than you.
1. hardware problem (NIC)
2. /etc/resolv.conf (shoud point to ISP nameservers, not router because you will get slower transfers)
2. kill ipv6
echo "alias net-pf-10 off" >> /etc/modprobe.conf
echo "alias ipv6 off" >> /etc/modprobe.conf
3. run
ifconfig and check txqueuelen value if 100 then run:
#/sbin/ifconfig eth0 txqueuelen 1000
4. adjust MTU. For DSL it should be 1454. But this can be tested:
ping IP_address_of_your_ISP -f -l 1373
you should see:
Reply from bytes=1372 time=53ms TTL=254
Reply from bytes=1372 time=56ms TTL=254
Reply from bytes=1372 time=56ms TTL=254
now increase MTU to the point when ping will generate output like this:
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.

It means that your MTU is too high. Enter best MTU value that gave non fragmented output.

5. this is a list few of sysctl variables that can help (some are security related) /etc/sysctl.conf:

net.core.netdev_max_backlog = 2500
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.tcp_no_metrics_save = 1
kernel.shmmax = 67108864
net.ipv4.route.flush = 1
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.tcp_window_scaling = 0
net.ipv4.tcp_sack = 1
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_reordering = 5
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 3
net.ipv4.tcp_fin_timeout = 15
net.ipv4.ip_forward = 0
net.ipv4.route.flush = 1
net.ipv4.conf.all.default_source_route = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.all.secure_redirects = 0
net.ipv4.conf.all.log_martians = 1
net.ipv4.tcp_keepalive_time = 1200
kernel.shmall = 67108864
kernel.shmmax = 67108864

check net.ipv4.ip_no_pmtu_disc default should be "1" if not then correct (/etc/sysctl.conf
net.ipv4.ip_no_pmtu_disc = 1
My calbe max transfer rate is ~380KB/sec. I am getting this on windows and FreeBSD. On SuSE i am getting 336.9 KB/sec. I dont have dualboot however windows and FBSD hardware is older.
Anyway my result is a little better than yours, so maybe all this will help


Last edited by broch; 02-22-2005 at 12:20 AM.


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