Difference between revisions of "Networking"
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| − | [[ | + | [[Category:networking]] |
| + | [[Category:Linux/Unix]] | ||
| + | |||
==Check network connections== | ==Check network connections== | ||
| Line 15: | Line 17: | ||
;<code>curl -vvv telnet://<IP>:<port></code> | ;<code>curl -vvv telnet://<IP>:<port></code> | ||
:Just test connectivity to a port | :Just test connectivity to a port | ||
| + | |||
| + | <syntaxhighlight lang=bash> | ||
| + | #!/bin/bash | ||
| + | |||
| + | PORT=$1 | ||
| + | |||
| + | TARGETS="999.999.999.999 | ||
| + | 888.888.888.888 | ||
| + | 777.777.777.777 | ||
| + | 666.666.666.666 | ||
| + | " | ||
| + | |||
| + | for TARGET in ${TARGETS} | ||
| + | do | ||
| + | curl http://${TARGET}:${PORT} --connect-timeout 1 > /dev/null 2>&1 | ||
| + | if [ $? == 28 ] | ||
| + | then | ||
| + | echo No connection to ${TARGET}:${PORT} | ||
| + | fi | ||
| + | done | ||
| + | </syntaxhighlight> | ||
===Wget=== | ===Wget=== | ||
| Line 20: | Line 43: | ||
:Get the data from <URL> | :Get the data from <URL> | ||
| − | === | + | ===[[OpenSSL]]=== |
| − | ;<code> | + | See the [[OpenSSL]] page |
| − | : | + | |
| + | ==Interfaces== | ||
| + | ;ifconfig -a | ||
| + | :Show all network interfaces | ||
| + | |||
| + | ;ifconfig <interface> <ipaddrss> | ||
| + | :Assign <ipaddress> to <interface> | ||
| + | |||
| + | ;mii-tool <interface> | ||
| + | :Show interface link status (speed) | ||
| + | |||
| + | ;The interfaces file | ||
| + | <syntaxhighlight lang=bash> | ||
| + | apt-get purge network-manager | ||
| + | vi /etc/network/interfaces | ||
| + | auto <interface> | ||
| + | iface <interface> inet dhcp | ||
| + | wpa-ssid <ssid> | ||
| + | wpa-psk <password> | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | For interfaces that may not be connected use <code>allow-hotplug</code> instead of <code>auto</code>.<br> | ||
| + | The bootprocces now does not wait for an DCHP-answer on disconnected interfaces. Saves you about 5 minutes during startup. | ||
| + | |||
| + | ==Routing== | ||
| + | ;route add -net default gw <IPaddress> | ||
| + | :Add a default route using <IPaddress> as gateway | ||
==Tunneling== | ==Tunneling== | ||
;<code>ssh -L 8080:remotehost:3006 proxy</code> | ;<code>ssh -L 8080:remotehost:3006 proxy</code> | ||
| − | :Login over ssh to proxy and there connect to remotehost port | + | :Login over ssh to proxy and there connect to remotehost port 3006. Connect local port 8080 to the remote connection. |
| − | :Now if you connect to port 8080 on your local server you are connected to port | + | :Now if you connect to port 8080 on your local server you are connected to port 3006 on the remotehost |
:Using <code>-nNT</code> prevents that the ssh command opens a terminal on the proxy. The ssh command however must remain active. | :Using <code>-nNT</code> prevents that the ssh command opens a terminal on the proxy. The ssh command however must remain active. | ||
| + | |||
| + | ==Tracing== | ||
| + | For tracing traffic see [[Tcpdump]] | ||
Revision as of 14:54, 25 December 2019
Check network connections
Netcat
nc -v -z <host> <port>- Tell me if we can open a connection to <host> on <port>. Without -z it works like telnet
nc -v -u -z <host> <port>- Tell me if we can open a connection to <host> on a UDP <port>
Curl
curl -vvv -k --proxy1.0 <proxyIP>:<proxyPort> <Remote URL>- Get the data from <remote URL> via <proxyIP> -k allows insecure SSL connections
curl -vvv telnet://<IP>:<port>- Just test connectivity to a port
#!/bin/bash
PORT=$1
TARGETS="999.999.999.999
888.888.888.888
777.777.777.777
666.666.666.666
"
for TARGET in ${TARGETS}
do
curl http://${TARGET}:${PORT} --connect-timeout 1 > /dev/null 2>&1
if [ $? == 28 ]
then
echo No connection to ${TARGET}:${PORT}
fi
done
Wget
wget <URL>- Get the data from <URL>
OpenSSL
See the OpenSSL page
Interfaces
- ifconfig -a
- Show all network interfaces
- ifconfig <interface> <ipaddrss>
- Assign <ipaddress> to <interface>
- mii-tool <interface>
- Show interface link status (speed)
- The interfaces file
apt-get purge network-manager
vi /etc/network/interfaces
auto <interface>
iface <interface> inet dhcp
wpa-ssid <ssid>
wpa-psk <password>
For interfaces that may not be connected use allow-hotplug instead of auto.
The bootprocces now does not wait for an DCHP-answer on disconnected interfaces. Saves you about 5 minutes during startup.
Routing
- route add -net default gw <IPaddress>
- Add a default route using <IPaddress> as gateway
Tunneling
ssh -L 8080:remotehost:3006 proxy- Login over ssh to proxy and there connect to remotehost port 3006. Connect local port 8080 to the remote connection.
- Now if you connect to port 8080 on your local server you are connected to port 3006 on the remotehost
- Using
-nNTprevents that the ssh command opens a terminal on the proxy. The ssh command however must remain active.
Tracing
For tracing traffic see Tcpdump