NAT Portforwarding loopback issue

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kernel-panic69
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Joined: 08 May 2018
Posts: 14208
Location: Texas, USA
PostPosted: Wed Apr 06, 2022 12:46    Post subject: Reply with quote
@the-j0ker: apacheguy did a hard reset before and after flashing. Re-read the build thread posts. I wasn't going to comment until I saw the same rhetoric in two places.

https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=331805&start=21

apacheguy wrote:
apacheguy wrote:
Router/Version: Netgear AC1450
Firmware: DD-WRT v3.0-r48567 (03/23/22)
Previous/Reset: Erased nvram before/after
Mode/Status: Gateway (dev only)
Issues/Errors: None. Not extensively tested


Update: I am experiencing issues with local loopback after upgrading. Yes, I did verify that “WAN NAT redirection” is unchecked (disabled). I also verified that clients outside my LAN can connect. I wasn’t experiencing this on the last build.

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apacheguy
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Joined: 26 Jun 2008
Posts: 88
PostPosted: Wed Apr 06, 2022 16:29    Post subject: Reply with quote
@kernel-panic99

This issue was resolved by switching from CTF to SFE. Why does CTF break NAT hairpin and is there a workaround?
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blkt
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Joined: 20 Jan 2019
Posts: 5695
PostPosted: Wed Apr 06, 2022 16:45    Post subject: Reply with quote
https://forum.dd-wrt.com/wiki/index.php/Hardware see caveats section.

https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1260510#1205011

https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1244653#1242801
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Per Yngve Berg
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Joined: 13 Aug 2013
Posts: 6865
Location: Romerike, Norway
PostPosted: Wed Apr 06, 2022 18:14    Post subject: Reply with quote
CTF works directly on the switch and bypasses the router.

Why don't you use local addresses locally, so you do not have to NAT loopback?
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apacheguy
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Joined: 26 Jun 2008
Posts: 88
PostPosted: Wed Apr 06, 2022 19:17    Post subject: Reply with quote
blkt wrote:
https://forum.dd-wrt.com/wiki/index.php/Hardware see caveats section.

https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1260510#1205011

https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1244653#1242801


Thanks. I was aware that CTF could interfere with port forwards of some protocols, but since it didn’t affect WAN clients I assumed that it wasn’t the case. Odd that CTF only affects port forwards for LAN clients.

@Per Yngve

That’s a big headache. Every time I go off my LAN I would have to reconfigure my profiles to use the external domain, and each time I am on my LAN I would have to revert the config.
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blkt
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Joined: 20 Jan 2019
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PostPosted: Thu Apr 07, 2022 10:45    Post subject: Reply with quote
With faster hardware there is no need for SFE CTF FA. Third link discusses hairpinning, search tedm posts.
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Per Yngve Berg
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Joined: 13 Aug 2013
Posts: 6865
Location: Romerike, Norway
PostPosted: Thu Apr 07, 2022 11:34    Post subject: Reply with quote
You can create several hosts in a domain.

host1.yourdomain.com
host2.yoydomain.con

On the dd-wrt router enter

address=/host1.yourdomain.com/192.168 1.1
address=/host2.yoydomain.con/192.168.1.2

No need to reconfigure.
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