[SOLVED] No Internet - Subnetting 101

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DrDoak
DD-WRT Novice


Joined: 21 Aug 2022
Posts: 2

PostPosted: Sun Aug 21, 2022 12:19    Post subject: [SOLVED] No Internet - Subnetting 101 Reply with quote
Hi all,

I am running a Linksys wrt1900 ac it is a second hand router that came with ddwrt installed.

I have gone through the setup steps. I can log into the router admin console to make changes and I can connect to bot 2.4 and the 5G however, there is no Internet access.

any suggestions for getting my router working?

I am new at all of this so looking for some help.

Thanks
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Monza
DD-WRT User


Joined: 01 Jul 2018
Posts: 438

PostPosted: Sun Aug 21, 2022 14:21    Post subject: Reply with quote
With a new router to the network resulting in no internet . . .my first troubleshoot it to reboot both the router AND the modem.

Some modems are sensitive to a network router change others don't care. Rebooting both is an easy step to see if your modem is one of the sensitives. After renegotiating the double reboot sometimes fixes the issue.
blkt
DD-WRT Guru


Joined: 20 Jan 2019
Posts: 5660

PostPosted: Sun Aug 21, 2022 14:28    Post subject: Reply with quote
There are four model variants. What does model show exactly on bottom? Label is in the upper right 'Model No.'
r49792 wrt1900ac, wrt1900acv2, wrt1900acs, wrt1900acsv2 DD-WRT WebUI Administration Firmware Upgrade.

Choose the correct file for your router's exact model. Also, be sure to keep the dropdown option 'Do not Reset'.
Flash over wired Ethernet to LAN. Confirm new build, WebUI upper-right corner. Administration Factory Defaults.

Clear history or use a portable. Temporary cache bypass: Ctrl+F5, Cmd+Shift+R, new private window/incognito.
Recommend portable web browser settings never remember history, disable forms autofill, logins, pass, spelling.
pickler
DD-WRT Novice


Joined: 19 Aug 2022
Posts: 21

PostPosted: Sun Aug 21, 2022 17:54    Post subject: Reply with quote
make sure your gateway address is not conflicting with your modem's. My ISP modem used 192.168.1.x which conflicted with dd-wrt. i had to switch dd-wrt to 192.168.3.1

dpp3530
DD-WRT Guru


Joined: 12 Dec 2007
Posts: 764
Location: Pittsburgh, PA USA

PostPosted: Mon Aug 22, 2022 0:42    Post subject: Reply with quote
Make sure you know what type of connection your ISP requires. The default in DD-WRT is Automatic (DHCP) and this is common for most ISPs, but not all. It may require authentication, or PPTP/L2TP. You can frequently google for "Use my own router with <provider name>" to find this information.

Also, depending on the provider, you may need to close the MAC address of the router your ISP provided. With my provider (Verizon), I did not have to clone the address but I did have to release DHCP on the ISP router, then renew on the WRT1900AC.

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DrDoak
DD-WRT Novice


Joined: 21 Aug 2022
Posts: 2

PostPosted: Fri Aug 26, 2022 0:50    Post subject: Reply with quote
pickler wrote:
make sure your gateway address is not conflicting with your modem's. My ISP modem used 192.168.1.x which conflicted with dd-wrt. i had to switch dd-wrt to 192.168.3.1



This worked for me! Thank you!
blkt
DD-WRT Guru


Joined: 20 Jan 2019
Posts: 5660

PostPosted: Thu Sep 01, 2022 5:24    Post subject: Reply with quote
If your ISP modem is 192.168.1.1 be aware your modem is already acting as a gateway so a double NAT situation.
An ISP should be able help configure the modem in true bridge mode, or close enough IP Passthrough or DMZplus.
dale_gribble39
DD-WRT Guru


Joined: 11 Jun 2022
Posts: 1899

PostPosted: Thu Sep 01, 2022 16:24    Post subject: Reply with quote
Double NAT is negligible. Unless the ISP equipment is less-powerful than the DD-WRT router behind it (or vice-versa), it's really not a show-stopper like it seems people think it is.
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dpp3530
DD-WRT Guru


Joined: 12 Dec 2007
Posts: 764
Location: Pittsburgh, PA USA

PostPosted: Thu Sep 01, 2022 21:20    Post subject: Reply with quote
dale_gribble39 wrote:
Double NAT is negligible. Unless the ISP equipment is less-powerful than the DD-WRT router behind it (or vice-versa), it's really not a show-stopper like it seems people think it is.


Kind of depends on what you're doing. I've got OpenVPN server running on my WRT1900AC and double-NAT would mean that I'd have to open ports on the actual edge router (ISP in this case).

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Netgear R7800
DD-WRT v3.0 STD
Linksys WRT1900AC
DD-WRT v3.0 STD
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