how u use the iptable firewall to restrict ssh,telnet,ftp

Categories >> Software >> Operating Systems >> Linux >> Linux AllOther
Suggest New Category

Question Posted / dalwinder singh

9 Answers
22195 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

how u use the iptable firewall to restrict ssh,telnet,ftp..

Answer / sins

simply use..... iptables -A INPUT -s <sourse ip or n/w u
want to block the services> -p tcp --dport <specify prt
number> -j REJECT/DROP/DENY

Is This Answer Correct ?

26 Yes

0 No

how u use the iptable firewall to restrict ssh,telnet,ftp..

Answer / rajesh dwivedi

If you restrict ssh/telnet or ftp u have to write a rule
for example u have to restrict ssh

IPTABLES -A INPUT -p tcp -s <IP Address or Domain IP> --
dport <ssh port> -j REJECT/DROP

Is This Answer Correct ?

12 Yes

0 No

how u use the iptable firewall to restrict ssh,telnet,ftp..

Answer / saurabh makkar

For SSH
iptables -A INPUT -s <sourse ip or n/w u
want to block the services> -p tcp --dport <22> -j
REJECT/DROP/DENY

For Telnet
iptables -A INPUT -s <sourse ip or n/w u
want to block the services> -p tcp --dport <23> -j
REJECT/DROP/DENY

For FTP
iptables -A INPUT -s <sourse ip or n/w u
want to block the services> -p tcp --dport <21> -j
REJECT/DROP/DENY

Is This Answer Correct ?

6 Yes

0 No

how u use the iptable firewall to restrict ssh,telnet,ftp..

Answer / srivathsan

Just a small typo to the file name, it is '/etc/hosts.deny'

Thanks,

- Vathsan.

Is This Answer Correct ?

5 Yes

2 No

how u use the iptable firewall to restrict ssh,telnet,ftp..

Answer / swapnil

if want to put on the INPUT then
iptables -A INPUT -s source -p protocol --dport destination
port -j DENY
if want to put the OUTPUT tables then
iptables -A OUTPUT -s source -p protocol --dport denation
port -j DENY

Is This Answer Correct ?

2 Yes

0 No

how u use the iptable firewall to restrict ssh,telnet,ftp..

Answer / srivathsan

Followed by iptables command mentioned by Sins to restrict
domains for various services, pleaese run
$ service iptables save
$ restorecon /etc/sysconfig/iptables.

Also, you could block the domains by adding an entry inside
/etc/hots.deny like,

sshd: <Unwanted domain url>

:qw to save changes to the file.

- Vathsan.

Is This Answer Correct ?

4 Yes

3 No

how u use the iptable firewall to restrict ssh,telnet,ftp..

Answer / nrupan mampilly

iptables -I INPUT -t filter -s source -p protocol --dport
portnumber -j REJECT

Is This Answer Correct ?

0 Yes

0 No

how u use the iptable firewall to restrict ssh,telnet,ftp..

Answer / sanjay

service iptables start
iptables on

Is This Answer Correct ?

10 Yes

12 No

how u use the iptable firewall to restrict ssh,telnet,ftp..

Answer / anil kumar pinnaka

chkconfig --level < run level for enabling the iptables > on

This will enables the ip table for the given run level.

so that these service will ge blocked.

Is This Answer Correct ?

1 Yes

15 No

Post New Answer