SOLVED: ASUS RT-AC5300 WAN setup for Static IP from the ISP

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dln949
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PostPosted: Mon Jul 18, 2022 23:43    Post subject: SOLVED: ASUS RT-AC5300 WAN setup for Static IP from the ISP Reply with quote
I have an Asus RT-AC5300 router with dd-wrt betas/2021/10-10-2021-r47528/asus-rt-ac5300/asus_rt-ac5300-firmware.trx (The reason the version of the dd-wrt is so old is because I received the router in Oct, 2021, but am just now for the first time trying to get it working.)

I've never worked with dd-wrt before, so I'm running into a number of issues.

The main problem is I cannot access the internet. My ISP gives me a static WAN IP address. When I select "Static IP" in the "WAN Setup" section of the "Basic Setup" tab under "Setup", the router asks for the "WAN IP Address", but then to the right of that is a slash ("/") and an additional field. But I have no idea what I am supposed to put into that additional field. Also, just from playing around, I've learned that if I leave that additional field at zero, the router will not save the "Gateway" IP address that my ISP gave me, and it reverts to all zeros.

(see my attached screenshot)

What is supposed to go into that extra field at the right end of the "WAN IP Address"?



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Last edited by dln949 on Tue Jul 19, 2022 5:21; edited 1 time in total
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kernel-panic69
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PostPosted: Tue Jul 19, 2022 1:36    Post subject: Reply with quote
Normally, it should be 24. Did your ISP specify a subnet mask / CIDR notation for your static IP address given? That would help us determine what to enter there.
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dln949
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PostPosted: Tue Jul 19, 2022 2:16    Post subject: Reply with quote
kernel-panic69 wrote:
Normally, it should be 24. Did your ISP specify a subnet mask / CIDR notation for your static IP address given? That would help us determine what to enter there.


subnet mask from the ISP is 255.255.255.192.
kernel-panic69
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PostPosted: Tue Jul 19, 2022 2:26    Post subject: Reply with quote
Then it should be /26 for CIDR.

https://kb.wisc.edu/ns/page.php?id=3493

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dln949
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Joined: 18 Jul 2022
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PostPosted: Tue Jul 19, 2022 2:59    Post subject: Reply with quote
kernel-panic69 wrote:
Then it should be /26 for CIDR.

https://kb.wisc.edu/ns/page.php?id=3493


Thank you, I will try that and report results.

(Never even heard of "CIDR", did some searches now to read about it, but I am far from a tech or network person, so I had no understanding of what I was reading. I'm wondering if dd-wrt is right for a layman like me. I'll keep at it, I really want to use an open source solution instead of a corporate OS.)
dln949
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Joined: 18 Jul 2022
Posts: 9

PostPosted: Tue Jul 19, 2022 5:20    Post subject: Reply with quote
Entering 26 as kernel-panic69 suggested worked. Thanks.
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