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Diagnosing network connectivity with mtr

Feb 212013

Diagnosing network connectivity with mtr

Answer:

To check the network connectivity to a specific server, you can use the mtr command.

e.g.

# mtr --report google.com
HOST: localhost                   Loss%   Snt   Last   Avg  Best  Wrst StDev
  1. 106.187.33.2                  0.0%    10    1.3   5.3   0.6  21.4   6.7
  2. 124.215.199.121               0.0%    10    0.6   6.5   0.4  12.4   4.8
  3. otejbb206.int-gw.kddi.ne.jp   0.0%    10    2.1   3.7   2.1  12.5   3.3
  4. ix-ote210.int-gw.kddi.ne.jp   0.0%    10    2.1   6.4   2.1  15.2   4.5
  5. 203.181.102.94                0.0%    10    2.6   2.7   2.2   3.9   0.6
  6. 209.85.249.195                0.0%    10    3.2   5.3   2.3  22.8   6.6
  7. 64.233.175.0                  0.0%    10    7.0  13.5   6.8  49.8  13.7
  8. 64.233.174.0                  0.0%    10   20.0  12.7  11.1  20.0   3.0
  9. 216.239.43.145                0.0%    10   12.0  11.8  11.5  12.2   0.2
 10. kix01s01-in-f8.1e100.net      0.0%    10   11.2  11.4  11.1  11.9   0.3

How to provide username and password when using curl?

Commands, Internet No Responses »

Jan 092013

How to provide username and password when using curl?

Answer:

To provide username and password when curl a url, you should use the "-u" or "--user" argument

e.g.

# curl --user john:password http://www.example.com

Modern way to show current IP address(es) in Linux

Advanced Linux, Commands, Internet No Responses »

Oct 082012

Modern way to show current IP address(es) in Linux

Answer:

In the past we already showed that you can get the IP information using the command "ifconfig", actually the modern way to do the job is

# ip a

1: lo:  mtu 16436 qdisc noqueue state UNKNOWN 
  ..

2: eth0:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:26:5e:3e:42:d2 brd ff:ff:ff:ff:ff:ff
 ..

How to add a static route using command

Commands, Internet No Responses »

Jul 112012

How to add a static route using command

Answer:

To add a static route, you can use a simple command like:

# sudo route add 192.168.15.0/24 192.168.1.1

The above command make all request to 192.168.15.0/24 (i.e. 192.168.15.1 to 192.168.15.254) route thru the gateway 192.168.1.1

How to show current routing table

Advanced Linux, Internet No Responses »

Jul 092012

How to show current routing table

Answer:

To show the current system's routing table, you can try:

# sudo netstat -nr
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         102.147.87.1    0.0.0.0         UG        0 0          0 eth0
0.0.0.0         102.147.45.1    0.0.0.0         UG        0 0          0 eth0
102.147.45.0    0.0.0.0         255.255.255.0   U         0 0          0 eth0
102.147.87.0    0.0.0.0         255.255.255.0   U         0 0          0 eth0

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