BlueBerrybun
DD-WRT Novice
Joined: 16 Aug 2020
Posts: 6
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 Posted: Sat Aug 09, 2025 19:40 Post subject: DDWRT sending unsolicited packed to GRC Shields Up! |
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Have a Linksys WRT 1900ACS router. Running DD-WRT v3.0-r62036 std (08/08/25)
I usually do a GRC Shields Up! test (port scanning the first 1056 ports) every time I update. As usual, all ports were stealthed. Solicited TCP Packets PASSED and Ping Echo PASSED.
However, my Unsolicited Packets test resulted in a RECEIVED FAILED status.
While I was trying to troubleshoot why this was happening, playing (checking/unchecking) with the new options under Security > Firewall...
| Code: | Detect and Block Port Scanners (checked),
Slowdown connection attempts (tarpit) (checked)
Filter TCP/SYN flood (unchecked, due to interfering with VPN)
Filter UDP Floods (unchecked, interfering with VPN)
Filter Ping Echo Request Floods (checked) |
...I ended up not being able to run the GRC test anymore. I think the server decided I was pinging it too many times and refused connection/tarballed me (already cleared all my cache and cookies, and it works fine from a different IP). So, I can't even continue my troubleshooting.
So what is happening here with my FAILED status, and how do I fix it?
It should be noted that ALL options under Security > Firewall are checked, EXCEPT for filter proxy, filter cookies, filter TOS/DSCP, Filter TCP/SYN floods, Filter UDP floods. |
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Per Yngve Berg
DD-WRT Guru
Joined: 13 Aug 2013
Posts: 7122
Location: Romerike, Norway
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| Posted: Sun Aug 10, 2025 10:10 Post subject: |
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This is how the Shields Up Test are working. Before you start, it show from what IP Address the test will originate from.
You should also Disable the Port Scan Protection, otherwise it will blocked after a few ports. |
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