Testing router security

Discussions for BiPAC 8900 series: 8900AX-1600, 8900AX-2400, 8900X
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nightcustard
Posts: 57
Joined: Sat Nov 03, 2012 2:50 pm

Testing router security

Post by nightcustard » Thu Nov 04, 2021 10:53 pm

Hi

I'd like to test the 8900AX2400's WAN-side firewall without having
to use a friend's internet connection or a web-based service. The former is not something I can do very often without risking annoyance, whilst the latter generally only offer limited functionality (unless you pay!)
The idea is to run nmap on a computer attached to a second router connected to the internet-facing end of the 8900's internal router - is such access possible?
I suspect not but thought it worth asking ๐Ÿ˜

Cheers Mike

billion_fan
Posts: 5272
Joined: Tue Jul 19, 2011 4:30 pm

Re: Testing router security

Post by billion_fan » Fri Nov 05, 2021 9:23 am

nightcustard wrote: โ†‘
Thu Nov 04, 2021 10:53 pm
Hi

I'd like to test the 8900AX2400's WAN-side firewall without having
to use a friend's internet connection or a web-based service. The former is not something I can do very often without risking annoyance, whilst the latter generally only offer limited functionality (unless you pay!)
The idea is to run nmap on a computer attached to a second router connected to the internet-facing end of the 8900's internal router - is such access possible?
I suspect not but thought it worth asking ๐Ÿ˜

Cheers Mike
I don't think that will work as you will be behind the same WAN IP

nightcustard
Posts: 57
Joined: Sat Nov 03, 2012 2:50 pm

Re: Testing router security

Post by nightcustard » Sun Nov 07, 2021 7:14 pm

billion_fan wrote: โ†‘
Fri Nov 05, 2021 9:23 am
nightcustard wrote: โ†‘
Thu Nov 04, 2021 10:53 pm
Hi

I'd like to test the 8900AX2400's WAN-side firewall without having
to use a friend's internet connection or a web-based service. The former is not something I can do very often without risking annoyance, whilst the latter generally only offer limited functionality (unless you pay!)
The idea is to run nmap on a computer attached to a second router connected to the internet-facing end of the 8900's internal router - is such access possible?
I suspect not but thought it worth asking ๐Ÿ˜

Cheers Mike
I don't think that will work as you will be behind the same WAN IP
Thanks BF. The idea came from a router security testing website - some ISPs block port scans and it was suggested as a way of avoiding that issue. It assumes the modem is a separate box, so you've got access to the input of the router - something the 8900 doesn't offer, I assume.
I've also found port scanning my external IP address using a tethered Android phone reports (falsely) all the 8900 ports are open (I think it's some sort of anti-scanning feature of the mobile internet). Ah well, back to relying on 'Shields Up'!
Cheers, Mike

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