Iptables” bank of america atm card no cvv

The firewall on a linux system is controlled by iptables (for ipv4) and ip6tables (for ipv6). This cheat sheet covers the most common ways to use iptables for those who want to protect their system from hackers or just want to understand the configuration.

Sample command output for an inactive firewall:

Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Для активного файрвола:

Chain INPUT (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 0 0 DROP all * * 0.0.0.0/0 0.0.0.0.0/0 state INVALID 394 43586 ACCEPT all * * 0.0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 93 17292 ACCEPT all br0 * 0.0.0.0.0/0 0.0.0.0/0 1 142 ACCEPT all lo * 0.0.0.0.0/0 0.0.0.0/0 Chain FORWARD (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT all br0 br0 0.0.0.0.0/0 0.0.0.0/0 0 0 DROP all * * 0.0.0.0.0/0 0.0.0.0/0 state INVALID 0 0 TCPMSS tcp * * 0.0.0.0.0/0 0.0.0.0/0 tcp flags:0x06/0x02 TCPMSS clamp to PMTU 0 0 0 ACCEPT all * * 0.0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 0 0 wanin all vlan2 * 0.0.0.0.0/0 0.0.0.0/0 0 0 0 wanout all * vlan2 0.0.0.0/0 0.0.0.0/0 0 0 0 ACCEPT all br0 * 0.0.0.0/0 0.0.0.0/0 Chain OUTPUT (policy ACCEPT 425 packets, 113K bytes) pkts bytes target prot opt in out source destination Chain wanin (1 references) pkts bytes target prot opt in out source destination Chain wanout (1 references) pkts bytes target prot opt in out source destination Where: -L : Show rule list. -v : Display additional information. This option shows the interface name, options, TOS masks. Also displays K, M or G suffixes. -n : Display IP address and port in numbers (without using DNS server to determine names. This will speed up the display).

Sample output:

Chain INPUT (policy DROP) num target prot opt source destination 1 DROP all 0.0.0.0/0 0.0.0.0/0 state INVALID 2 ACCEPT all 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 3 ACCEPT all 0.0.0.0/0 0.0.0.0/0 4 ACCEPT all 0.0.0.0/0 0.0.0.0/0 Chain FORWARD (policy DROP) num target prot opt source destination 1 ACCEPT all 0.0.0.0/0 0.0.0.0/0 2 DROP all 0.0.0.0/0 0.0.0.0/0 state INVALID 3 TCPMSS tcp 0.0.0.0/0 0.0.0.0/0 tcp flags:0x06/0x02 TCPMSS clamp to PMTU 4 ACCEPT all 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 5 wanin all 0.0.0.0/0 0.0.0.0/0 6 wanout all 0.0.0.0/0 0.0.0.0/0 7 ACCEPT all 0.0.0.0/0 0.0.0.0/0 Chain OUTPUT (policy ACCEPT) num target prot opt source destination Chain wanin (1 references) num target prot opt source destination Chain wanout (1 references) num target prot opt source destination Вы можете использовать номера строк для того, чтобы добавлять новые правила.

Where: -F : Delete (flush) all rules. -X : Delete the chain. -t table_name : Select a table (nat or mangle) and delete all rules. -P : Select default actions (such as DROP, REJECT, or ACCEPT).

Where: -D : Remove one or more rules from the chain.

Sample output:

The output will become:

List of IP addresses for isolated networks: 10.0.0.0/8 -j (A) 172.16.0.0/12 (B) 192.168.0.0/16 (C) 224.0.0.0/4 (MULTICAST D) 240.0.0.0/5 (E) 127.0.0.0/8 (LOOPBACK)

Вывод: facebook.com has address 69.171.228.40

Output: CIDR: 69.171.224.0/19

15. Log event and reset. To log packet traffic before resetting, add a rule:

20. Close or open standard ports. Replace ACCEPT with DROP to lock the port.

Where: connlimit-above 3 : Specifies that the rule is valid only if the number of connections exceeds 3. connlimit-mask 24 : Specifies the network mask.

Help for iptables. To find help on iptables, use man: $ man iptables

Check with telnet $ telnet ya.ru 80

You can use nmap to check: $ nmap -sS -p 80 ya.ru

Iptables is a great tool in the hands of an administrator. If you need an easy way to protect yourself in Ubuntu desktop, you should know that there is a nice console add-on for iptables called UFW, and there is a GUFW GUI program attached to it. =============================================================

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