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IPTables blocks all incoming traffic from other networks

 
 
Angus Macleod
Guest
Posts: n/a

 
      07-09-2007, 02:49 PM
My DNS server is a freestanding server with a public IP address, and it has
a Firestarter firewall. When the firewall runs, only addresses on the same
network as the DNS server can get a response from DNS/FTP/SSH. When I boot
without the firewall, anyone can access them - as well as everything else!.

This is my first foray into IPTables, but the following IPTables entries
should, I believe, allow access from anyone to DNS, SSH and FTP:

ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:20
flags:!0x16/0x02
ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:21
ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:22
ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:53
ACCEPT udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:53

Something else must be blocking access from outside of xx.yyy.zz/26 and
there is a lot in the tables that I do not understand. Below is the output
from iptables -L -n (I removed some entries I feel do not contribute to the
issue). Can someone tell me what causes the blockage?

Thanks,

Angus.


ns2:/sbin# ./iptables -L -n
Chain INPUT (policy DROP)
target prot opt source destination
UNCLEAN all -- 0.0.0.0/0 0.0.0.0/0 unclean
ACCEPT tcp -- 67.154.209.206 0.0.0.0/0 tcp
flags:!0x16/0x02
ACCEPT udp -- 67.154.209.206 0.0.0.0/0
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
ACCEPT icmp -- 0.0.0.0/0 xx.yyy.zz.128/26 limit: avg
10/sec burst 5
LD all -- 0.0.0.0/8 xx.yyy.zz.128/26
LD all -- 1.0.0.0/8 xx.yyy.zz.128/26
LD all -- 2.0.0.0/8 xx.yyy.zz.128/26
LD all -- 5.0.0.0/8 xx.yyy.zz.128/26
LD all -- 7.0.0.0/8 xx.yyy.zz.128/26

.... more similar nnn.0.0.0/8 entries are here ...

LD all -- 187.0.0.0/8 xx.yyy.zz.128/26
LD all -- 189.0.0.0/8 xx.yyy.zz.128/26
LD all -- 190.0.0.0/8 xx.yyy.zz.128/26
LD all -- 192.0.2.0/24 xx.yyy.zz.128/26
LD all -- 192.168.0.0/16 xx.yyy.zz.128/26
LD all -- 197.0.0.0/8 xx.yyy.zz.128/26
LD all -- 198.18.0.0/15 xx.yyy.zz.128/26
LD all -- 223.0.0.0/8 xx.yyy.zz.128/26
LD all -- 224.0.0.0/3 xx.yyy.zz.128/26
LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:31337
limit: avg 2/min burst 5
LD udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:31337
limit: avg 2/min burst 5
LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:33270
limit: avg 2/min burst 5
LD udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:33270
limit: avg 2/min burst 5
LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:1234
limit: avg 2/min burst 5
LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:6711
limit: avg 2/min burst 5
LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:16660
flags:0x16/0x02 limit: avg 2/min burst 5
LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:60001
flags:0x16/0x02 limit: avg 2/min burst 5
LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp
dpts:12345:12346 limit: avg 2/min burst 5
LD udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp
dpts:12345:12346 limit: avg 2/min burst 5
LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:135
limit: avg 2/min burst 5
LD udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:135
limit: avg 2/min burst 5
LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:1524
limit: avg 2/min burst 5
LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:27665
limit: avg 2/min burst 5
LD udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:27444
limit: avg 2/min burst 5
LD udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:31335
limit: avg 2/min burst 5
LD all -- 224.0.0.0/8 0.0.0.0/0
LD all -- 0.0.0.0/0 224.0.0.0/8
LD all -- 255.255.255.255 0.0.0.0/0
LD all -- 0.0.0.0/0 0.0.0.0
DROP all -- 10.0.0.255 0.0.0.0/0
DROP all -- 0.0.0.0 0.0.0.0/0
DROP all -- 0.0.0.0/0 255.255.255.255
DROP all -- 0.0.0.0/0 0.0.0.0
LD all -- 0.0.0.0/0 0.0.0.0/0 state INVALID
LD all -f 0.0.0.0/0 0.0.0.0/0 limit: avg
10/min burst 5
ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:20
flags:!0x16/0x02
ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:21
ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:22
ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:53
ACCEPT udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:53
LD tcp -- 0.0.0.0/0 0.0.0.0/0 tcp
flags:!0x16/0x02 state NEW
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:22
dpts:513:65535 flags:!0x16/0x02 state RELATED
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:20
dpts:1023:65535 flags:!0x16/0x02 state RELATED
STATE tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp
dpts:1024:65535
ACCEPT udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp
dpts:1023:65535
LD all -- 0.0.0.0/0 0.0.0.0/0

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy DROP)
target prot opt source destination
UNCLEAN all -- 0.0.0.0/0 0.0.0.0/0 unclean
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:31337
limit: avg 2/min burst 5
LD udp -- xx.yyy.zz.128/26 0.0.0.0/0 udp dpt:31337
limit: avg 2/min burst 5
LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:33270
limit: avg 2/min burst 5
LD udp -- xx.yyy.zz.128/26 0.0.0.0/0 udp dpt:33270
limit: avg 2/min burst 5
LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:1234
limit: avg 2/min burst 5
LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:6711
limit: avg 2/min burst 5
LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:16660
flags:0x16/0x02 limit: avg 2/min burst 5
LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:60001
flags:0x16/0x02 limit: avg 2/min burst 5
LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp
dpts:12345:12346 limit: avg 2/min burst 5
LD udp -- xx.yyy.zz.128/26 0.0.0.0/0 udp
dpts:12345:12346 limit: avg 2/min burst 5
LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:135
limit: avg 2/min burst 5
LD udp -- xx.yyy.zz.128/26 0.0.0.0/0 udp dpt:135
limit: avg 2/min burst 5
LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:1524
limit: avg 2/min burst 5
LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:27665
limit: avg 2/min burst 5
LD udp -- xx.yyy.zz.128/26 0.0.0.0/0 udp dpt:27444
limit: avg 2/min burst 5
LD udp -- xx.yyy.zz.128/26 0.0.0.0/0 udp dpt:31335
limit: avg 2/min burst 5
LD all -- 224.0.0.0/8 0.0.0.0/0
LD all -- 0.0.0.0/0 224.0.0.0/8
LD all -- 255.255.255.255 0.0.0.0/0
LD all -- 0.0.0.0/0 0.0.0.0
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp
flags:!0x16/0x02 state NEW
all -- 0.0.0.0/0 0.0.0.0/0 TTL match TTL ==
64
ACCEPT icmp -- xx.yyy.zz.128/26 0.0.0.0/0
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0

Chain LD (146 references)
target prot opt source destination
LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0
level 4
DROP all -- 0.0.0.0/0 0.0.0.0/0

Chain SANITY (0 references)
target prot opt source destination
LD all -- 0.0.0.0/0 0.0.0.0/0

Chain STATE (1 references)
target prot opt source destination
LD all -- 0.0.0.0/0 0.0.0.0/0 state NEW
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state
RELATED,ESTABLISHED
LD all -- 0.0.0.0/0 0.0.0.0/0

Chain UNCLEAN (2 references)
target prot opt source destination
LD all -- 0.0.0.0/0 0.0.0.0/0
ns2:/sbin#
 
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Angus Macleod
Guest
Posts: n/a

 
      07-10-2007, 04:16 PM
I hacked the firewall script and by a process of elimination found that it
was the very records I thought were irrelevant that were causing the
problem - each one blocked all traffic from an entire network not just the
non-routable addresses as implied by the firewall script comments.

"Angus Macleod" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed). ..
> My DNS server is a freestanding server with a public IP address, and it
has
> a Firestarter firewall. When the firewall runs, only addresses on the same
> network as the DNS server can get a response from DNS/FTP/SSH. When I boot
> without the firewall, anyone can access them - as well as everything
else!.
>
> This is my first foray into IPTables, but the following IPTables entries
> should, I believe, allow access from anyone to DNS, SSH and FTP:
>
> ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:20
> flags:!0x16/0x02
> ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:21
> ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:22
> ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:53
> ACCEPT udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:53
>
> Something else must be blocking access from outside of xx.yyy.zz/26 and
> there is a lot in the tables that I do not understand. Below is the output
> from iptables -L -n (I removed some entries I feel do not contribute to
the
> issue). Can someone tell me what causes the blockage?
>
> Thanks,
>
> Angus.
>
>
> ns2:/sbin# ./iptables -L -n
> Chain INPUT (policy DROP)
> target prot opt source destination
> UNCLEAN all -- 0.0.0.0/0 0.0.0.0/0 unclean
> ACCEPT tcp -- 67.154.209.206 0.0.0.0/0 tcp
> flags:!0x16/0x02
> ACCEPT udp -- 67.154.209.206 0.0.0.0/0
> ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
> ACCEPT icmp -- 0.0.0.0/0 xx.yyy.zz.128/26 limit: avg
> 10/sec burst 5
> LD all -- 0.0.0.0/8 xx.yyy.zz.128/26
> LD all -- 1.0.0.0/8 xx.yyy.zz.128/26
> LD all -- 2.0.0.0/8 xx.yyy.zz.128/26
> LD all -- 5.0.0.0/8 xx.yyy.zz.128/26
> LD all -- 7.0.0.0/8 xx.yyy.zz.128/26
>
> ... more similar nnn.0.0.0/8 entries are here ...
>
> LD all -- 187.0.0.0/8 xx.yyy.zz.128/26
> LD all -- 189.0.0.0/8 xx.yyy.zz.128/26
> LD all -- 190.0.0.0/8 xx.yyy.zz.128/26
> LD all -- 192.0.2.0/24 xx.yyy.zz.128/26
> LD all -- 192.168.0.0/16 xx.yyy.zz.128/26
> LD all -- 197.0.0.0/8 xx.yyy.zz.128/26
> LD all -- 198.18.0.0/15 xx.yyy.zz.128/26
> LD all -- 223.0.0.0/8 xx.yyy.zz.128/26
> LD all -- 224.0.0.0/3 xx.yyy.zz.128/26
> LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:31337
> limit: avg 2/min burst 5
> LD udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:31337
> limit: avg 2/min burst 5
> LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:33270
> limit: avg 2/min burst 5
> LD udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:33270
> limit: avg 2/min burst 5
> LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:1234
> limit: avg 2/min burst 5
> LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:6711
> limit: avg 2/min burst 5
> LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:16660
> flags:0x16/0x02 limit: avg 2/min burst 5
> LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:60001
> flags:0x16/0x02 limit: avg 2/min burst 5
> LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp
> dpts:12345:12346 limit: avg 2/min burst 5
> LD udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp
> dpts:12345:12346 limit: avg 2/min burst 5
> LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:135
> limit: avg 2/min burst 5
> LD udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:135
> limit: avg 2/min burst 5
> LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:1524
> limit: avg 2/min burst 5
> LD tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:27665
> limit: avg 2/min burst 5
> LD udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:27444
> limit: avg 2/min burst 5
> LD udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:31335
> limit: avg 2/min burst 5
> LD all -- 224.0.0.0/8 0.0.0.0/0
> LD all -- 0.0.0.0/0 224.0.0.0/8
> LD all -- 255.255.255.255 0.0.0.0/0
> LD all -- 0.0.0.0/0 0.0.0.0
> DROP all -- 10.0.0.255 0.0.0.0/0
> DROP all -- 0.0.0.0 0.0.0.0/0
> DROP all -- 0.0.0.0/0 255.255.255.255
> DROP all -- 0.0.0.0/0 0.0.0.0
> LD all -- 0.0.0.0/0 0.0.0.0/0 state INVALID
> LD all -f 0.0.0.0/0 0.0.0.0/0 limit: avg
> 10/min burst 5
> ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:20
> flags:!0x16/0x02
> ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:21
> ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:22
> ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:53
> ACCEPT udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:53
> LD tcp -- 0.0.0.0/0 0.0.0.0/0 tcp
> flags:!0x16/0x02 state NEW
> ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:22
> dpts:513:65535 flags:!0x16/0x02 state RELATED
> ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:20
> dpts:1023:65535 flags:!0x16/0x02 state RELATED
> STATE tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp
> dpts:1024:65535
> ACCEPT udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp
> dpts:1023:65535
> LD all -- 0.0.0.0/0 0.0.0.0/0
>
> Chain FORWARD (policy ACCEPT)
> target prot opt source destination
>
> Chain OUTPUT (policy DROP)
> target prot opt source destination
> UNCLEAN all -- 0.0.0.0/0 0.0.0.0/0 unclean
> ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
> LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:31337
> limit: avg 2/min burst 5
> LD udp -- xx.yyy.zz.128/26 0.0.0.0/0 udp dpt:31337
> limit: avg 2/min burst 5
> LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:33270
> limit: avg 2/min burst 5
> LD udp -- xx.yyy.zz.128/26 0.0.0.0/0 udp dpt:33270
> limit: avg 2/min burst 5
> LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:1234
> limit: avg 2/min burst 5
> LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:6711
> limit: avg 2/min burst 5
> LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:16660
> flags:0x16/0x02 limit: avg 2/min burst 5
> LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:60001
> flags:0x16/0x02 limit: avg 2/min burst 5
> LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp
> dpts:12345:12346 limit: avg 2/min burst 5
> LD udp -- xx.yyy.zz.128/26 0.0.0.0/0 udp
> dpts:12345:12346 limit: avg 2/min burst 5
> LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:135
> limit: avg 2/min burst 5
> LD udp -- xx.yyy.zz.128/26 0.0.0.0/0 udp dpt:135
> limit: avg 2/min burst 5
> LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:1524
> limit: avg 2/min burst 5
> LD tcp -- xx.yyy.zz.128/26 0.0.0.0/0 tcp dpt:27665
> limit: avg 2/min burst 5
> LD udp -- xx.yyy.zz.128/26 0.0.0.0/0 udp dpt:27444
> limit: avg 2/min burst 5
> LD udp -- xx.yyy.zz.128/26 0.0.0.0/0 udp dpt:31335
> limit: avg 2/min burst 5
> LD all -- 224.0.0.0/8 0.0.0.0/0
> LD all -- 0.0.0.0/0 224.0.0.0/8
> LD all -- 255.255.255.255 0.0.0.0/0
> LD all -- 0.0.0.0/0 0.0.0.0
> DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp
> flags:!0x16/0x02 state NEW
> all -- 0.0.0.0/0 0.0.0.0/0 TTL match TTL
==
> 64
> ACCEPT icmp -- xx.yyy.zz.128/26 0.0.0.0/0
> ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
>
> Chain LD (146 references)
> target prot opt source destination
> LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0
> level 4
> DROP all -- 0.0.0.0/0 0.0.0.0/0
>
> Chain SANITY (0 references)
> target prot opt source destination
> LD all -- 0.0.0.0/0 0.0.0.0/0
>
> Chain STATE (1 references)
> target prot opt source destination
> LD all -- 0.0.0.0/0 0.0.0.0/0 state NEW
> ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state
> RELATED,ESTABLISHED
> LD all -- 0.0.0.0/0 0.0.0.0/0
>
> Chain UNCLEAN (2 references)
> target prot opt source destination
> LD all -- 0.0.0.0/0 0.0.0.0/0
> ns2:/sbin#
>
>
 
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Pascal Hambourg
Guest
Posts: n/a

 
      07-10-2007, 09:09 PM
Hello,

Angus Macleod a écrit :
> My DNS server is a freestanding server with a public IP address, and it has
> a Firestarter firewall. When the firewall runs, only addresses on the same
> network as the DNS server can get a response from DNS/FTP/SSH. When I boot
> without the firewall, anyone can access them - as well as everything else!.
>
> This is my first foray into IPTables, but the following IPTables entries
> should, I believe, allow access from anyone to DNS, SSH and FTP:
>
> ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:20
> flags:!0x16/0x02

What is that rule for ?

> ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:21
> ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:22
> ACCEPT tcp -- 0.0.0.0/0 xx.yyy.zz.128/26 tcp dpt:53
> ACCEPT udp -- 0.0.0.0/0 xx.yyy.zz.128/26 udp dpt:53
>
> Something else must be blocking access from outside of xx.yyy.zz/26 and
> there is a lot in the tables that I do not understand. Below is the output
> from iptables -L -n (I removed some entries I feel do not contribute to the
> issue). Can someone tell me what causes the blockage?

If you admit you do not understand all the rules, it was a bad idea to
remove some of them. Also, note that iptables -L without -v hides some
capital information such as the input and output interfaces. I
personnally prefer the output format of iptables-save, which is more
compact and closer to the iptables rule creation syntax. Last, my
opinion is that this ruleset is a piece of rubbish. And yes, I can
elaborate if needed.
 
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