Internet Connection Troubleshoot
troubleshooting internet connection
- ping own ip
- good: reply with time <0.1ms
- ping router / default gateway
- good: reply with time < 1ms
- ping dns
- good: if you use your isp dns, ping should be < 50ms.
- bad: ping >400ms or some time-outs. dns should have zero time-out.
- ping a domain name
- good: time < 500ms
- bad: if error can not resolve hostname then your dns not working. use other nameservers that work.
- copy-paste all the result and email to your administrator or your ISP
- save it and print it for your own record
lower time mean lower latency. usually means a better, faster connection.
higher time could mean high traffic that cause some lag
windows
- click on windows Start button
- choose Run
- type cmd and press enter key
- type ipconfig /all and press enter key
- troubleshoot
below is example result of a good working internet connection (change all the ip with your ipconfig result)
C:\Documents and Settings\xp>ipconfig /all
Windows IP Configuration
Host Name . . . . . . . . . . . . : windows-1c8b87e
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : harco-mas.com
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . : harco-mas.com
Description . . . . . . . . . . . : 3Com 3C918 Integrated Fast Ethernet
Controller (3C905B-TX Compatible) #2
Physical Address. . . . . . . . . : 00-C0-4F-76-7A-BA
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.18.165
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.18.18
DHCP Server . . . . . . . . . . . : 192.168.18.18
DNS Servers . . . . . . . . . . . : 208.67.222.222
208.67.220.220
207.225.209.77
192.168.18.88
Lease Obtained. . . . . . . . . . : Wednesday, July 12, 2000 12:01:12 A
Lease Expires . . . . . . . . . . : Wednesday, July 12, 2000 10:01:12 A
C:\Documents and Settings\xp>ping 192.168.18.165
Pinging 192.168.18.165 with 32 bytes of data:
Reply from 192.168.18.165: bytes=32 time<1ms TTL=128
Reply from 192.168.18.165: bytes=32 time<1ms TTL=128
Reply from 192.168.18.165: bytes=32 time<1ms TTL=128
Reply from 192.168.18.165: bytes=32 time<1ms TTL=128
Ping statistics for 192.168.18.165:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:\Documents and Settings\xp>ping 192.168.18.18
Pinging 192.168.18.18 with 32 bytes of data:
Reply from 192.168.18.18: bytes=32 time<1ms TTL=64
Reply from 192.168.18.18: bytes=32 time<1ms TTL=64
Reply from 192.168.18.18: bytes=32 time<1ms TTL=64
Reply from 192.168.18.18: bytes=32 time<1ms TTL=64
Ping statistics for 192.168.18.18:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:\Documents and Settings\xp>ping 208.67.222.222
Pinging 208.67.222.222 with 32 bytes of data:
Reply from 208.67.222.222: bytes=32 time=208ms TTL=54
Reply from 208.67.222.222: bytes=32 time=207ms TTL=54
Reply from 208.67.222.222: bytes=32 time=208ms TTL=54
Reply from 208.67.222.222: bytes=32 time=206ms TTL=54
Ping statistics for 208.67.222.222:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 206ms, Maximum = 208ms, Average = 207ms
C:\Documents and Settings\xp>ping 208.67.220.220
Pinging 208.67.220.220 with 32 bytes of data:
Reply from 208.67.220.220: bytes=32 time=217ms TTL=54
Reply from 208.67.220.220: bytes=32 time=218ms TTL=54
Reply from 208.67.220.220: bytes=32 time=211ms TTL=54
Reply from 208.67.220.220: bytes=32 time=217ms TTL=54
Ping statistics for 208.67.220.220:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 211ms, Maximum = 218ms, Average = 215ms
C:\Documents and Settings\xp>ping 207.225.209.77
Pinging 207.225.209.77 with 32 bytes of data:
Reply from 207.225.209.77: bytes=32 time=245ms TTL=50
Reply from 207.225.209.77: bytes=32 time=240ms TTL=50
Reply from 207.225.209.77: bytes=32 time=238ms TTL=50
Reply from 207.225.209.77: bytes=32 time=247ms TTL=50
Ping statistics for 207.225.209.77:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 238ms, Maximum = 247ms, Average = 242ms
C:\Documents and Settings\xp>ping 192.168.18.88
Pinging 192.168.18.88 with 32 bytes of data:
Reply from 192.168.18.88: bytes=32 time<1ms TTL=64
Reply from 192.168.18.88: bytes=32 time<1ms TTL=64
Reply from 192.168.18.88: bytes=32 time<1ms TTL=64
Reply from 192.168.18.88: bytes=32 time<1ms TTL=64
Ping statistics for 192.168.18.88:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:\Documents and Settings\xp>ping plasa.com
Pinging plasa.com [202.134.0.12] with 32 bytes of data:
Reply from 202.134.0.12: bytes=32 time=13ms TTL=249
Reply from 202.134.0.12: bytes=32 time=11ms TTL=249
Reply from 202.134.0.12: bytes=32 time=10ms TTL=249
Reply from 202.134.0.12: bytes=32 time=14ms TTL=249
Ping statistics for 202.134.0.12:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 10ms, Maximum = 14ms, Average = 12ms
C:\Documents and Settings\xp>
linux
# sudo ifconfig
eth0 Link encap:Ethernet HWaddr 00:0c:76:fd:aa:90
inet addr:172.16.1.248 Bcast:172.16.1.255 Mask:255.255.255.0
inet6 addr: fe80::20c:76ff:fefd:aa90/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:229240 errors:0 dropped:0 overruns:0 frame:0
TX packets:224010 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:100482373 (95.8 MB) TX bytes:51028514 (48.6 MB)
Interrupt:19
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:32663 errors:0 dropped:0 overruns:0 frame:0
TX packets:32663 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5527112 (5.2 MB) TX bytes:5527112 (5.2 MB)
# sudo route
Destination Gateway Genmask Flags Metric Ref Use Iface
172.16.1.0 * 255.255.255.0 U 0 0 0 eth0
default 172.16.1.1 0.0.0.0 UG 0 0 0 eth0
# cat /etc/resolv.conf
nameserver 208.67.222.222
nameserver 208.67.220.220
# ping -c 5 172.16.1.248
PING 172.16.1.248 (172.16.1.248) 56(84) bytes of data.
64 bytes from 172.16.1.248: icmp_seq=1 ttl=64 time=0.140 ms
64 bytes from 172.16.1.248: icmp_seq=2 ttl=64 time=0.071 ms
64 bytes from 172.16.1.248: icmp_seq=3 ttl=64 time=0.069 ms
64 bytes from 172.16.1.248: icmp_seq=4 ttl=64 time=0.072 ms
64 bytes from 172.16.1.248: icmp_seq=5 ttl=64 time=0.069 ms
--- 172.16.1.248 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4007ms
rtt min/avg/max/mdev = 0.069/0.084/0.140/0.028 ms
# ping -c 5 172.16.1.1
PING 172.16.1.1 (172.16.1.1) 56(84) bytes of data.
64 bytes from 172.16.1.1: icmp_seq=1 ttl=64 time=0.599 ms
64 bytes from 172.16.1.1: icmp_seq=2 ttl=64 time=0.628 ms
64 bytes from 172.16.1.1: icmp_seq=3 ttl=64 time=0.607 ms
64 bytes from 172.16.1.1: icmp_seq=4 ttl=64 time=0.585 ms
64 bytes from 172.16.1.1: icmp_seq=5 ttl=64 time=0.612 ms
--- 172.16.1.1 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 3999ms
rtt min/avg/max/mdev = 0.585/0.606/0.628/0.021 ms
# ping -c 5 208.67.222.222
PING 208.67.222.222 (208.67.222.222) 56(84) bytes of data.
64 bytes from 208.67.222.222: icmp_seq=1 ttl=53 time=256 ms
64 bytes from 208.67.222.222: icmp_seq=2 ttl=53 time=255 ms
64 bytes from 208.67.222.222: icmp_seq=3 ttl=53 time=261 ms
64 bytes from 208.67.222.222: icmp_seq=4 ttl=53 time=241 ms
64 bytes from 208.67.222.222: icmp_seq=5 ttl=53 time=233 ms
--- 208.67.222.222 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4012ms
rtt min/avg/max/mdev = 233.359/249.662/261.558/10.570 ms
# ping -c 5 208.67.220.220
PING 208.67.220.220 (208.67.220.220) 56(84) bytes of data.
64 bytes from 208.67.220.220: icmp_seq=1 ttl=53 time=215 ms
64 bytes from 208.67.220.220: icmp_seq=2 ttl=53 time=219 ms
64 bytes from 208.67.220.220: icmp_seq=3 ttl=53 time=218 ms
64 bytes from 208.67.220.220: icmp_seq=4 ttl=53 time=231 ms
64 bytes from 208.67.220.220: icmp_seq=5 ttl=53 time=239 ms
--- 208.67.220.220 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4012ms
rtt min/avg/max/mdev = 215.261/224.790/239.935/9.375 ms
# ping -c 5 plasa.com
PING plasa.com (202.134.0.12) 56(84) bytes of data.
64 bytes from web.plasa.com (202.134.0.12): icmp_seq=1 ttl=243 time=32.8 ms
64 bytes from web.plasa.com (202.134.0.12): icmp_seq=2 ttl=243 time=32.6 ms
64 bytes from web.plasa.com (202.134.0.12): icmp_seq=3 ttl=243 time=30.0 ms
64 bytes from web.plasa.com (202.134.0.12): icmp_seq=5 ttl=243 time=24.4 ms
--- plasa.com ping statistics ---
5 packets transmitted, 4 received, 20% packet loss, time 4007ms
rtt min/avg/max/mdev = 24.431/29.987/32.814/3.392 ms
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