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 Linux Networking   Hardware/Software related, Modems, Internet connection sharing, IPTables etc.

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Old 02-02-2006   #1 (permalink)
Linux Engineer
 
Join Date: Sep 2004
Posts: 1,279
Slow connection to Internet
Hi folks,

FC3
Mozilla Firefox
Standard firewall - Iptable

My workstation is connected to 1.5Mb ADSL broadband. Recently on browsing Internet it takes a considerable time connecting websites. It did not happen in the past. I contacted the ISP reporting this problem. After checking the network he requested me taking following measures;

1) ping website checking whether there are package losses
2) disable auto dectect settings
3) reduce cache to 30Mb

Hereinunder are the results
1) # ping -c 25 yahoo.com
Code:
PING yahoo.com (216.109.112.135) 56(84) bytes of data.
.....
......
--- yahoo.com ping statistics ---
25 packets transmitted, 25 received, 0% packet loss, time 31926ms
rtt min/avg/max/mdev = 298.039/303.828/309.182/3.021 ms, pipe 2
# ping -c 25 google.com
Code:
PING google.com (64.233.167.99) 56(84) bytes of data.
...
....
--- google.com ping statistics ---
25 packets transmitted, 25 received, 0% packet loss, time 28713ms
rtt min/avg/max/mdev = 265.137/267.465/270.636/1.427 ms, pipe 2
No packet loss found.

2) Mozilla firefox
Preference
General -> Connection -> Connection Settings ->
Configure Proxies to Access the Internet
Only check - Direct connection to the Internet

3) Privacy -> Cache -> Use up to: 50000 (original) KB of disk space for the cache
Changed to : 30000 KB

Re-start Mozilla firefox - situation remained more less the same
Re-boot PC -> start Mozilla Firefox again - not much improvement.

Please advise what other measures I can take. TIA

B.R.
satimis
satimis is offline  



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Old 02-02-2006   #2 (permalink)
Super Moderator
 
Join Date: May 2004
Location: Arch Linux
Posts: 12,685
Not sure this would help, but you could try disabling IPV6 like this:

Either add the line: "alias net-pf-10 off" (without quotes)
to the end of your /etc/modprobe.conf file, as root.

or...

as root, do this:

# echo "alias net-pf-10 off" >> /etc/modprobe.conf

Besure to restart your network, or reboot to test this.

ozar
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Old 02-03-2006   #3 (permalink)
Linux Engineer
 
Join Date: Sep 2004
Posts: 1,279
Hi ozar,

Tks for your advice.

Quote:
Not sure this would help, but you could try disabling IPV6 like this:

Either add the line: "alias net-pf-10 off" (without quotes)
to the end of your /etc/modprobe.conf file, as root.
The line is already on /etc/modprobe.conf

Also having added to /etc/sysctl.conf following line;
net.ipv4.tcp_default_win_scale = 0

I'm trying to ascertain whether it is ISP's problem OR the problem of the network setting of the PC.

# telnet www.google.com 80
Code:
Trying 66.102.7.99...
Connected to www.google.com (66.102.7.99).
Escape character is '^]'.
^]
Connection closed by foreign host.
# traceroute www.google.com
Code:
traceroute: Warning: www.google.com has multiple addresses; using 66.102.7.147
traceroute to www.l.google.com (66.102.7.147), 30 hops max, 38 byte packets
 1  203.88.164.1 (203.88.164.1)  18.827 ms  17.280 ms  18.159 ms
 2  202-123-94-73.ihenderson.com (202.123.94.73)  18.119 ms  18.391 ms  17.936 ms
 3  202-123-94-41.ihenderson.com (202.123.94.41)  17.942 ms  17.258 ms  16.728 ms
 4  203.131.241.121 (203.131.241.121)  19.154 ms  19.478 ms  18.684 ms
 5  ge-0-0-0.r01.newthk01.hk.bb.verio.net (203.131.240.92)  19.153 ms  51.244 ms  19.146 ms
 6  p4-1-1-0.r01.tokyjp01.jp.bb.verio.net (129.250.3.197)  97.674 ms  98.693 ms  97.968 ms
     MPLS Label=188624 CoS=5 TTL=1 S=0
 7  ge-7-0-2.r21.tokyjp01.jp.bb.verio.net (129.250.3.181)  87.410 ms  86.109 ms  98.726 ms
     MPLS Label=638624 CoS=5 TTL=1 S=0
 8  p64-2-1-0.r21.sttlwa01.us.bb.verio.net (129.250.4.185)  208.866 ms  208.567 ms  208.121 ms
     MPLS Label=760498 CoS=5 TTL=1 S=0
 9  xe-0-2-0.r20.sttlwa01.us.bb.verio.net (129.250.4.16)  195.201 ms  206.968 ms  252.771 ms
10  p16-1.sprint.sttlwa01.us.bb.verio.net (129.250.9.62)  285.255 ms p16-0.sprint.sttlwa01.us.bb.verio.net (129.250.8.122)  207.980 ms  206.269 ms
11  sl-bb22-tac-6-0.sprintlink.net (144.232.9.151)  207.590 ms  207.438 ms  207.629 ms
12  sl-bb23-tac-15-0.sprintlink.net (144.232.17.182)  208.232 ms  214.497 ms  211.829 ms
13  sl-bb22-sj-9-0.sprintlink.net (144.232.20.8)  198.286 ms  198.060 ms  198.878 ms
14  sl-bb21-sj-14-0.sprintlink.net (144.232.3.161)  198.930 ms  197.310 ms  198.042 ms
15  sl-st20-sj-13-0.sprintlink.net (144.232.9.58)  197.581 ms  198.048 ms  198.258 ms
traceroute seems slow.

I also ran following tests to check NIC;

1)
# mii-tool -v
Code:
eth0: autonegotiation failed, link ok
  product info: vendor 00:00:00, model 0 rev 0
  basic mode:   autonegotiation enabled
  basic status: autonegotiation complete, link ok
  capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
  advertising:  100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
This is a 10/100 Mbit, full duplex card. But it is not displayed. Why autonegotiation failed?

# ethtool eth0
Code:
Settings for eth0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 10Mb/s
        Duplex: Half
        Port: MII
        PHYAD: 32
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: pumbg
        Wake-on: d
        Current message level: 0x00000007 (7)
        Link detected: yes
The speed shown here is 10Mb/s

# ethtool -S eth0
Code:
NIC statistics:
     early_rx: 0
     tx_buf_mapped: 0
     tx_timeouts: 0
     rx_lost_in_ring: 0
Not much information displayed here.

# netstat -i
Code:
Kernel Interface table
Iface       MTU Met    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0       1500   0     7322      0      0      0     7420      0      0      0 BMRU
lo        16436   0     1752      0      0      0     1752      0      0      0 LRU
ppp0       1492   0     6908      0      0      0     7006      0      0      0 MOPRU
Would there be a problem on NIC?

Any advice?

TIA

B.R.
satimis
satimis is offline   Reply With Quote
Old 02-03-2006   #4 (permalink)
Linux Engineer
 
Join Date: Sep 2004
Posts: 1,279
Hi ozar,

Tks for your advice.

Quote:
Not sure this would help, but you could try disabling IPV6 like this:

Either add the line: "alias net-pf-10 off" (without quotes)
to the end of your /etc/modprobe.conf file, as root.
The line is already on /etc/modprobe.conf

Also having added to /etc/sysctl.conf following line;
net.ipv4.tcp_default_win_scale = 0

I'm trying to ascertain whether it is ISP's problem OR the problem of the network setting of the PC.

# telnet www.google.com 80
Code:
Trying 66.102.7.99...
Connected to www.google.com (66.102.7.99).
Escape character is '^]'.
^]
Connection closed by foreign host.
# traceroute www.google.com
Code:
traceroute: Warning: www.google.com has multiple addresses; using 66.102.7.147
traceroute to www.l.google.com (66.102.7.147), 30 hops max, 38 byte packets
 1  203.88.164.1 (203.88.164.1)  18.827 ms  17.280 ms  18.159 ms
 2  202-123-94-73.ihenderson.com (202.123.94.73)  18.119 ms  18.391 ms  17.936 ms
 3  202-123-94-41.ihenderson.com (202.123.94.41)  17.942 ms  17.258 ms  16.728 ms
 4  203.131.241.121 (203.131.241.121)  19.154 ms  19.478 ms  18.684 ms
 5  ge-0-0-0.r01.newthk01.hk.bb.verio.net (203.131.240.92)  19.153 ms  51.244 ms  19.146 ms
 6  p4-1-1-0.r01.tokyjp01.jp.bb.verio.net (129.250.3.197)  97.674 ms  98.693 ms  97.968 ms
     MPLS Label=188624 CoS=5 TTL=1 S=0
 7  ge-7-0-2.r21.tokyjp01.jp.bb.verio.net (129.250.3.181)  87.410 ms  86.109 ms  98.726 ms
     MPLS Label=638624 CoS=5 TTL=1 S=0
 8  p64-2-1-0.r21.sttlwa01.us.bb.verio.net (129.250.4.185)  208.866 ms  208.567 ms  208.121 ms
     MPLS Label=760498 CoS=5 TTL=1 S=0
 9  xe-0-2-0.r20.sttlwa01.us.bb.verio.net (129.250.4.16)  195.201 ms  206.968 ms  252.771 ms
10  p16-1.sprint.sttlwa01.us.bb.verio.net (129.250.9.62)  285.255 ms p16-0.sprint.sttlwa01.us.bb.verio.net (129.250.8.122)  207.980 ms  206.269 ms
11  sl-bb22-tac-6-0.sprintlink.net (144.232.9.151)  207.590 ms  207.438 ms  207.629 ms
12  sl-bb23-tac-15-0.sprintlink.net (144.232.17.182)  208.232 ms  214.497 ms  211.829 ms
13  sl-bb22-sj-9-0.sprintlink.net (144.232.20.8)  198.286 ms  198.060 ms  198.878 ms
14  sl-bb21-sj-14-0.sprintlink.net (144.232.3.161)  198.930 ms  197.310 ms  198.042 ms
15  sl-st20-sj-13-0.sprintlink.net (144.232.9.58)  197.581 ms  198.048 ms  198.258 ms
traceroute seems slow.

I also ran following tests to check NIC;

1)
# mii-tool -v
Code:
eth0: autonegotiation failed, link ok
  product info: vendor 00:00:00, model 0 rev 0
  basic mode:   autonegotiation enabled
  basic status: autonegotiation complete, link ok
  capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
  advertising:  100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
This is a 10/100 Mbit, full duplex card. But it is not displayed. Why autonegotiation failed?

# ethtool eth0
Code:
Settings for eth0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 10Mb/s
        Duplex: Half
        Port: MII
        PHYAD: 32
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: pumbg
        Wake-on: d
        Current message level: 0x00000007 (7)
        Link detected: yes
The speed shown here is 10Mb/s

# ethtool -S eth0
Code:
NIC statistics:
     early_rx: 0
     tx_buf_mapped: 0
     tx_timeouts: 0
     rx_lost_in_ring: 0
Not much information displayed here.

# netstat -i
Code:
Kernel Interface table
Iface       MTU Met    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0       1500   0     7322      0      0      0     7420      0      0      0 BMRU
lo        16436   0     1752      0      0      0     1752      0      0      0 LRU
ppp0       1492   0     6908      0      0      0     7006      0      0      0 MOPRU
Would there be a problem on NIC?

Any advice?

TIA

B.R.
satimis
satimis is offline   Reply With Quote
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