![]() My application is similar (but different) to a common SOHO user application in which DD-WRT is performing NAT to access the internet and in the same time the web panel of the WAN-attached DSL modem (see ). SNAT would change my LAN address into the DD-WRT WAN address for any related outgoing traffic, complying with the above said rule. In my case, SNAT is needed because the web interfaces I want to access (that are on the WAN network of my DD-WRT box) accept connections on that IP class only, so they refuse any packet with different IP source address. in iptables terminology, Source NAT, that is to modify the source IP address of a packet during routing. NAT stands for Network Address Translation and this is what I mean to do to be more specific, I need SNAT, i.e. You are undervaluating the purpose of NAT: don't think of "what NAT is used for" but of "what NAT means and what it can do". The Gateway Router does not have a route to the network. If you cannot access some nodes, they are misconfigured with either:Ģ. You have enabled NAT on the wrong router. NAT is used at the gateway between public and private addresses. any other traffic) is simply FORWARDED/ROUTED to WAN (to the upstream gateway) without NATĪs I put before, this is mostly a routing mode operation, except for LAN to WAN traffic, which requires NAT to access some web interfaces that don't accept the DD-WRT LAN IP addresses. LAN to WAN network needs to be NATted (SNAT, i.e. So, to express it plainly, this is the required setup: You ask which issue I'm facing because you think you have described all the kinds of possible traffic (LAN, WLAN, WAN), but I started with a configuration in router mode and its "WAN network" is NOT the general "internet". I understand your concern here we are speaking about an advanced (or I'd better say "mixed") routing/natting configuration, so I was wondering where it is better to start with (gateway or router mode) to achieve "the other function" too. ![]() In Gateway Mode, LAN2WAN traffic is NAT'ed. modify the general behaviour of the router via iptables commands) so I can enable it just where it is needed (in my case just for LAN2WAN traffic)? If I select gateway mode, can I turn NAT off (i.e. ![]() POSTROUTING chain on iptables) in router mode? (This implies there is a kernel tweak to enable/disable the nat table of ipchain even from the DD-WRT GUI) Does anybody know how to turn on the NAT function (i.e. So, to solve the issue, here is the dilemma: I knew that "in router mode NAT is disabled" but I supposed that option was just deactivating a predefined setup for iptables to make configuration easier from the DD-WRT GUI (thus I supposed I could have written a simple firewall script to enable outbound NAT as I needed), but now I realize that the selection of the operating mode of DD-WRT switches something at a lower level. To solve the issue, I sniffed the outgoing WAN traffic, realizing that SNAT is simply *not performed* packets are just forwarded to WAN with their original source LAN addresses (which are not accepted) ignoring the given POSTROUTING rule. I'm unable to make SNAT to work on my DD-WRT box configured in router mode to access from LAN the web interfaces of some devices located on the WAN network, no matter if I had added some iptables rules to the setup. If it is not, enable it, and click on start.Posted: Sun 17:18 Post subject: Enable NAT in router mode or Modify NAT in gateway mode? Navigate to System > Startup, and ensure that the miniupnpd entry is enabled. Once miniupnpd is installed, it may be necessary to take an addition step to enable it. To enable/disable NAT-PMP edit /etc/config/upnpd file:Īlso, you need to apply changeset 25251: it's basically a matter of editing /etc/init.d/miniupnpd, something you can do directly on your live router using nano please be advised that failing to apply the patch correctly miniupnpd might stop working correctly.įinally, you may need to execute the following uci set /etc/init.d/miniupnpd restart If you are only looking for UPnP functionality, miniupnpd is all you need. Note that the minidlna package is quite large, and may not fit on routers with a fresh install on Openwrt. They are configured in /etc/config/minidlna or /etc/config/miniupnpd respectively. The repositories for OpenWrt Backfire contain minidlna and miniupnpd to provide UPnP support.
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