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Asked by mokkan
at 2024-08-09 06:31:45
ModifyPoint:500 Replies:4 POST_ID:828729USER_ID:11612
Topic:
Linux;;Unix Operating Systems
When I look at iptables, i can see lots of rules as default, but when I do iptables -L, it shows only the following line only. Am I missing some thing?
DROP tcp -- 192.168.112.25 anywhere tcp dpt:ssh
[root@server3 init.d]# cat /etc/sysconfig/iptables
# Generated by iptables-save v1.4.7 on Sun Aug 4 00:11:30 2013
*nat
:PREROUTING ACCEPT [134:10773]
:POSTROUTING ACCEPT [333:35516]
:OUTPUT ACCEPT [350:37659]
-A POSTROUTING -s 192.168.122.0/24 ! -d 192.168.122.0/24 -p tcp -j MASQUERADE --to-ports 1024-65535
-A POSTROUTING -s 192.168.122.0/24 ! -d 192.168.122.0/24 -p udp -j MASQUERADE --to-ports 1024-65535
-A POSTROUTING -s 192.168.122.0/24 ! -d 192.168.122.0/24 -j MASQUERADE
COMMIT
# Completed on Sun Aug 4 00:11:30 2013
# Generated by iptables-save v1.4.7 on Sun Aug 4 00:11:30 2013
*mangle
:PREROUTING ACCEPT [57821:26615023]
:INPUT ACCEPT [57814:26614317]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [50045:72013933]
:POSTROUTING ACCEPT [50501:72086655]
-A POSTROUTING -o virbr0 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill
COMMIT
# Completed on Sun Aug 4 00:11:30 2013
# Generated by iptables-save v1.4.7 on Sun Aug 4 00:11:30 2013
*filter
:INPUT ACCEPT [89:7135]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [75:7234]
-A INPUT -s 192.168.112.25/32 -p tcp -m tcp --dport 22 -j DROP
COMMIT
# Completed on Sun Aug 4 00:11:30 2013
[root@server3 init.d]# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
DROP tcp -- 192.168.112.25 anywhere tcp dpt:ssh
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
DROP tcp -- 192.168.112.25 anywhere tcp dpt:ssh
[root@server3 init.d]# cat /etc/sysconfig/iptables
# Generated by iptables-save v1.4.7 on Sun Aug 4 00:11:30 2013
*nat
:PREROUTING ACCEPT [134:10773]
:POSTROUTING ACCEPT [333:35516]
:OUTPUT ACCEPT [350:37659]
-A POSTROUTING -s 192.168.122.0/24 ! -d 192.168.122.0/24 -p tcp -j MASQUERADE --to-ports 1024-65535
-A POSTROUTING -s 192.168.122.0/24 ! -d 192.168.122.0/24 -p udp -j MASQUERADE --to-ports 1024-65535
-A POSTROUTING -s 192.168.122.0/24 ! -d 192.168.122.0/24 -j MASQUERADE
COMMIT
# Completed on Sun Aug 4 00:11:30 2013
# Generated by iptables-save v1.4.7 on Sun Aug 4 00:11:30 2013
*mangle
:PREROUTING ACCEPT [57821:26615023]
:INPUT ACCEPT [57814:26614317]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [50045:72013933]
:POSTROUTING ACCEPT [50501:72086655]
-A POSTROUTING -o virbr0 -p udp -m udp --dport 68 -j CHECKSUM --checksum-fill
COMMIT
# Completed on Sun Aug 4 00:11:30 2013
# Generated by iptables-save v1.4.7 on Sun Aug 4 00:11:30 2013
*filter
:INPUT ACCEPT [89:7135]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [75:7234]
-A INPUT -s 192.168.112.25/32 -p tcp -m tcp --dport 22 -j DROP
COMMIT
# Completed on Sun Aug 4 00:11:30 2013
[root@server3 init.d]# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
DROP tcp -- 192.168.112.25 anywhere tcp dpt:ssh
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Author: mokkan replied at 2024-08-09 07:43:43
I found the reason. When I do iptables -L , it only shoes the filter type. I need to check other types to see all the values in iptables such as mangel, raw and nat.
Thank you for your help.
Thank you for your help.
Expert: duncanb7 replied at 2024-08-09 07:27:08
I think you need to re-installip talbes if you could not see it, please see the second link
Author: mokkan replied at 2024-08-09 07:16:45
thank you for your reply. My question is that why it is not showing up when I do iptables -L ?
Accepted Solution
Expert: duncanb7 replied at 2024-08-09 06:37:20
500 points GOOD
