Networking
From Linuxintro
Here are the articles that deal with networking:
- connect to the net
- set up networking
- set up Network Address Translation
- teaming your network cards
- set up a firewall
- networking commands
- network troubleshooting
- network sniffing
Network hints
- find out if you are connected to the internet:
ping 8.8.8.8
- find all computers in the subnet
nmap -sP 192.168.178.0/24
- 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
