Remove LAN interface
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Yeah... maybe your laptop had a rfc1918 address? 192.168.100 is common for modems to hand out.
Also as mentioned you almost always have to reboot a cable modem when you change the device connected to it.. To release the mac pairing.
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It was locked to the laptop MAC. I spoofed the interface with the MAC and it obtained an IP.
Connection doesn't seem stable though. I can't route traffic out the new WAN gateway. Also, the interface bounces between up and down frequently.
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Have you actually validated with your ISP that you should get and be able to use a 2nd IPv4 address on this interface.. I find it highly unlikely that ISPs would just let users have a 2nd IP without the user paying for it at min.
Are you paying for more than 1 IPv4 address?
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I called a few times and each person had a different answer. First it was only one IP address per modem, then it was we don't offer the service of adding a second IP anymore, finally it was we don't lock ports on customer provided modems. That's when I tried with a laptop.
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@johnpoz said in Remove LAN interface:
Have you actually validated with your ISP that you should get and be able to use a 2nd IPv4 address on this interface.. I find it highly unlikely that ISPs would just let users have a 2nd IP without the user paying for it at min.
I read about it on a my ISP's user forum, which is moderated by some employees. I am not paying extra for the 2nd address.
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And are you on the same ISP as the OP?
That your ISP doesn't charge for extra IPs is nice for you - they are leaving money on the table ;) More then likely they don't even know its happening and have just not locked it down yet ;)
Are you on a business line, that an ISP would hand out multiiple IPv4 in this day and age of shortages seems like really bad business practice if you ask me.
That 2nd IP could be used to support another customer, or at min get more money from you per month.. If they just have IPs sitting there unused... But to hand them out for free, they should prob fire their business model guy ;)
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@johnpoz said in Remove LAN interface:
Are you on a business line
No, just a plain residential account. However, I generally don't use the 2nd address, other than for occasional testing.
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My ISP used to offer the service of a 2nd IP but now they don't. Yet they don't lock down customer modems with multiple ports.
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So I tried removing the spoofed Mac and turned the modem off for a few minutes. Second wan connection received an IP but the first did not.
Also, when I purchased my modem I had to give the MAC address to them. Since the modem only has one MAC I think that's where they are limited although I could be wrong.
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@angdigi said in Remove LAN interface:
Also, when I purchased my modem I had to give the MAC address to them. Since the modem only has one MAC I think that's where they are limited although I could be wrong.
The modem MAC address is used only for communication with or through the modem, not what's beyond.
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Interesting. Do you know of any tips/tricks to keep the interface up instead of bouncing up and down?
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@angdigi
Not really, as I've never experienced that problem. My service is rock solid.
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Isn't this considered "flapping". Maybe it's something on the NIC that's causing the issue and not the ISP....
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@angdigi said in Remove LAN interface:
of any tips/tricks to keep the interface up instead of bouncing up and down?
Take a switch.
Put it between the modem and pfSense.
Now, observe where the flapping happens.
On the flapping side, check port parameters - or just change the materiel and/or NIC if possible. -
@angdigi said in Remove LAN interface:
Isn't this considered "flapping". Maybe it's something on the NIC that's causing the issue and not the ISP....
Flapping is generally a term for when a mac address moves rapidly between different ports on a switch / switches.
