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--- linux:network [2020/01/14 11:53] – [Test] tmade
+++ linux:network [2026/06/24 15:38] (current) – [Test] tmade
@@ Line 22: / Line 22: @@
   route add -host hostname.domain gw 192.168.1.1
   route add -net 192.168.1.0 netmask 255.255.255.0 dev eth0
+  route add -net 192.168.30.0 netmask 255.255.255.0 gw 192.168.30.2
   route add -host 192.168.0.1 dev ippp0
   route del -host 192.168.0.1
   route add default gw 192.168.0.1
+==="ip" command===
+  ip a                                                            #show running interface(s) configuration
+  ip addr add 10.0.2.15/24 dev enp0s3                             #temporary set ip to interface "enp0s3"
+  sudo ip link set enp0s3 down                                    #interface "enp0s3" down
+  sudo ip link set enp0s3 up                                      #interface "enp0s3" up
+  sudo ip route add default via 10.0.2.2                          #temporary set default gateway
+===Config===
 === Commandline Configuration IP command ===
@@ Line 188: / Line 199: @@
   tcpdump -i eth0
   tcpdump -niany
-  tcpdump -i eth0 -s 65535 -w tracefile                  #Create dump, which can be imported in wireshark
+  tcpdump -i eth0 -s 65535 -w tracefile                               #Create dump, which can be imported in wireshark
+  tcpdump -i eth0:0 -s 65535 -w tracefile.`date +%d.%m.%Y.%H.%M.%S`
+  tcpdump -i eth1 -s 84 -w tracefile.`date +%d.%m.%Y.%H.%M.%S`        #dump just header files
   tcpdump -i eth1 -qtln icmp
@@ Line 210: / Line 223: @@
   telnet localhost 25
   telnet IP 25
+  telnet 192.168.0.20 25
   echo quit | telnet 192.168.1.1 22 | grep –i connected
+If there´s no telnet:
-Additionally you can send Mails with it:
+    nc -zv 192.168.0.20 25
+or:
+    lsof -Pi :8443                     #just local test
+or:
+  echo >/dev/tcp/localhost/25
+  echo >/dev/tcp/192.168.0.20/25
+=== Mails with telnet ===
   ehlo testmail.org (Identify and demand SMTP-Modus)
@@ Line 223: / Line 248: @@
 Tip:
   reset (enables to send additionally emails)
+===curl===
+  curl -v -H "Host: my-server.mydomain.com" 127.0.0.1:8443                     #test connectivity locally on host to simulate external access
+  curl -v -H "Host: www.example.com" http://192.168.1.100                      #connect to 192.168.1.100 and rewrite/ manipulate hostheader to www.example.com
+  curl -X GET https://my-domain.de:6443                                        #check if port is open
+  curl --noproxy "*" http://localhost:8080                                     #check if port is open
+  curl -v http://localhost:8080
+  curl -v 1.2.3.4:80
 === jmeter (performance tests) ===