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Question

I'm trying to do the equivalent of this iptables rule in firewalld

iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE

How can I do this?

score 6 · Accepted Answer · 2014-08-22 12:45:59Z

6

To set up masquerading on the external zone, type:

# firewall-cmd --zone=external --add-masquerade

external: For use on external networks with masquerading enabled especially for routers. You do not trust the other computers on the network to not harm your computer. Only selected incoming connections are accepted.

internal: For use on internal networks. You mostly trust the other computers on the networks to not harm your computer. Only selected incoming connections are accepted.

For reference:

http://www.certdepot.net/rhel7-get-started-firewalld/

answered Aug 22 '14 at 12:45

TBI Infotech

1,406514

I get a warning saying ALREADY_ENABLED. Should that be the case? – Jacob Tomlinson Aug 22 '14 at 12:58
Also there is no mention of 10.8.0.0/24 in your config. – Jacob Tomlinson Aug 22 '14 at 13:54
1
@JacobTomlinson In that case, it's already enabled, and your question makes no sense. – Michael Hampton?Aug 22 '14 at 14:08
1
yes @JacobTomlinson is right about it,if active than what is issue actually – TBI Infotech Aug 26 '14 at 9:42

add a comment

1

You do not use directly rules like that. You simply put your interface (eth0) into external zone, which is already preconfigured in RHEL7/CentOS7 and it has masquerade turned on, or you can enable masquerading on the zone your interface is in. By default it's public. So the correct answer would be either:

# firewall-cmd --zone=public --add-masquerade

or

# firewall-cmd --change-zone=eth0 --zone=external

That is really all you need to do. To enable NAT only for particular subnet or range, you need Rich Rule or Direct rule. That's bit more complex. You can also simply refuse packets for others which seems also an option.

answered Nov 16 '16 at 15:36

lzap

1,80111917

add a comment

0

Alternatively you can add the rule to your: /etc/firewalld/direct.xml file eg.

<?xml version="1.0" encoding="utf-8"?>
<direct>
...
  <rule priority="0" table="filter" ipv="ipv4" chain="POSTROUTING">-table nat -jump MASQUERADE --source 10.8.0.0/24 --out-interface eth0</rule>  
</direct>

Then:

firewall-cmd --reload

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score 1 · Answer 2 · 2016-11-16 15:36:34Z

You do not use directly rules like that. You simply put your interface (eth0) into external zone, which is already preconfigured in RHEL7/CentOS7 and it has masquerade turned on, or you can enable masquerading on the zone your interface is in. By default it's public. So the correct answer would be either:

# firewall-cmd --zone=public --add-masquerade

or

# firewall-cmd --change-zone=eth0 --zone=external

That is really all you need to do. To enable NAT only for particular subnet or range, you need Rich Rule or Direct rule. That's bit more complex. You can also simply refuse packets for others which seems also an option.

score 0 · Answer 3 · 2015-06-24T12:53:52

Alternatively you can add the rule to your: /etc/firewalld/direct.xml file eg.

<?xml version="1.0" encoding="utf-8"?>
<direct>
...
  <rule priority="0" table="filter" ipv="ipv4" chain="POSTROUTING">-table nat -jump MASQUERADE --source 10.8.0.0/24 --out-interface eth0</rule>  
</direct>

Then:

firewall-cmd --reload

HQY 一个和谐有爱的空间

HQY

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2019
05
14:33:53

Firewalld CentOS 7 Masquerading

3 Answers

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HQY 一个和谐有爱的空间

HQY

20

20190514:33:53

Firewalld CentOS 7 Masquerading

3 Answers

发表评论:

2019
05
14:33:53