Analog Broken Cable

Last Login:fri Jan 03:53:09 from 192.168.5.120

[Email protected] ~]#

[Email protected] ~]#

[Email protected] ~]#

[Email protected] ~]#

[Email protected] ~]# Clear

[Email protected] ~]# iptables--list

Chain INPUT (Policy ACCEPT)

Target Prot opt source destination

Chain FORWARD (Policy ACCEPT)

Target Prot opt source destination

Chain OUTPUT (Policy ACCEPT)

Target Prot opt source destination

[[email protected] ~]# Ping 192.168.5.120

PING 192.168.5.120 (192.168.5.120) bytes of data.

Bytes from 192.168.5.120:icmp_seq=1 ttl=64 time=0.267 ms

Bytes from 192.168.5.120:icmp_seq=2 ttl=64 time=0.333 ms

Bytes from 192.168.5.120:icmp_seq=3 ttl=64 time=0.265 ms

^c

---192.168.5.120 ping statistics---

3 Packets transmitted, 3 received, 0% packet loss, time 2259ms

RTT Min/avg/max/mdev = 0.265/0.288/0.333/0.034 ms

Disable IP

Note: parameter -i insert (add), -d delete (delete). followed by the rules, input means inbound, ***.***.***.*** to be blocked. ip drop means to discard the connection   pass the -s Specify the source address to restrict.

[Email protected] ~]# iptables-i input-s 192.168.5.120-j DROP

[Email protected] ~]# iptables--list

Chain INPUT (Policy ACCEPT)

Target Prot opt source destination

DROP All--192.168.5.120 anywhere

Chain FORWARD (Policy ACCEPT)

Target Prot opt source destination

Chain OUTPUT (Policy ACCEPT)

Target Prot opt source destination

[[email protected] ~]# Ping 192.168.5.120

PING 192.168.5.120 (192.168.5.120) bytes of data.

^c

---192.168.5.120 ping statistics---

Packets transmitted, 0 received, 100% packet loss, time 114008ms

Recover IP

[Email protected] ~]# iptables-d input-s 192.168.5.120-j DROP

[Email protected] ~]# iptables--list

Chain INPUT (Policy ACCEPT)

Target Prot opt source destination

Chain FORWARD (Policy ACCEPT)

Target Prot opt source destination

Chain OUTPUT (Policy ACCEPT)

Target Prot opt source destination

[[email protected] ~]# Ping 192.168.5.120

PING 192.168.5.120 (192.168.5.120) bytes of data.

Bytes from 192.168.5.120:icmp_seq=1 ttl=64 time=0.288 ms

Bytes from 192.168.5.120:icmp_seq=2 ttl=64 time=0.276 ms

Bytes from 192.168.5.120:icmp_seq=3 ttl=64 time=0.256 ms

^c

---192.168.5.120 ping statistics---

3 Packets transmitted, 3 received, 0% packet loss, time 2389ms

RTT Min/avg/max/mdev = 0.256/0.273/0.288/0.018 ms

[Email protected] ~]#

Analog Broken Cable