---
title: "Strange dd-wrt Firewall Rules"
id: "66"
type: "post"
slug: "strange-dd-wrt-firewall-rules"
published_at: "2008-08-27T21:40:10+00:00"
modified_at: "2014-04-12T20:33:59+00:00"
url: "https://johnpoelstra.com/strange-dd-wrt-firewall-rules/"
markdown_url: "https://johnpoelstra.com/strange-dd-wrt-firewall-rules.md"
excerpt: "I recently got the urge to do a security review of a network I manage with a Linksys Router. It was running the latest version of dd-wrt with a set of unmodified (as best I knew) firewall rules. I had......"
taxonomy_category:
  - "Software & Technology"
taxonomy_post_tag:
  - "Linux"
---

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# [Strange dd-wrt Firewall Rules](https://johnpoelstra.com/strange-dd-wrt-firewall-rules/)

I recently got the urge to do a security review of a network I manage with a Linksys Router. It was running the latest version of [dd-wrt](http://www.dd-wrt.com)
 with a set of unmodified (as best I knew) firewall rules. I had a scare when the first thing I saw was:

```
root@DD-WRT:~# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     0    --  u12-20.dsl.vianetworks.de  anywhere
ACCEPT     0    --  newmedia.bensheim.manet.de  anywhere
ACCEPT     0    --  anywhere             anywhere            state RELATED,ESTABLISHED

--cut--
```

Apparently this is a *known issue* with the **vpn version** of dd-wrt v24 sp1. I could only find one reference to it on the internet [here](http://www.dd-wrt.com/phpBB2/viewtopic.php?t=35783&postdays=0&postorder=asc&start=0)
. The form thread explains a few ways to disable it and a fix has been checked into the main source tree. It was still a little unnerving considering this was the first thing I looked at!

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August 27, 2008

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