Networking

Here are the articles that deal with networking:

• connect to the net
• set up networking
• set up Network Address Translation
• teaming your network cards
• routing
• set up a firewall
• networking commands
• network troubleshooting
• network sniffing
• find out if you are connected to the internet:

ping 8.8.8.8

• test mtu:

ping -Mdo -s 8972 192.168.178.1

• show all connections:

netstat -putan

• show all server sockets that are listening:

lsof -i

• find out if TOE is switched on

# ethtool --show-offload eth2
Offload parameters for eth2:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: on
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: on

• fake MAC address

ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx

• listen on a specific port

ngrep -qd lo port 21

• create WLAN traffic

aireplay -3 -b <MACofAP> -h <MACtoFake> -x 600 eth1

• slow down port 1234

tc qdisc  add dev eth0 root handle 1: cbq avpkt 1000 bandwidth 10mbit
tc class  add dev eth0 parent 1: classid 1:1 cbq rate 8kbit allot 1500 prio 5 bounded isolated
tc filter add dev eth0 parent 1: protocol ip prio 16 u32 match ip sport 1234 0xffff flowid 1:1
tc qdisc  add dev eth0 parent 1:1 sfq perturb 10

Services

• set up a web server
• control a Computer via the network