Hello list,
I use net-firewall/shorewall to protect my machines; it's served me well for many years. My ISP gave me a FritzBox modem-router recently, in the hope of better media streaming, but it's spamming my LAN server with HTTP requests (port 80). The other machines are left alone; just this one is affected.
The many log entries are not a serious problem, just a nuisance, but I'd rather not have to put up with them.
AVM, the modem's maker, says I should set shorewall up on this machine to accept either port-80 requests or unsolicited packets of type 0x88e1. That type is HomePlug Management, apparently, and the FritzBox is looking for any such devices on the LAN. I don't know why it's picked on this one machine
to query, unless it's because it has the lowest IP address.
Questions:
1. Will I be opening myself to external HTTP attacks if I open that port to the modem-router? I assume I will, though no such service is running - at
the moment.
2. As far as I can see, shorewall filters only on ports, not packet types. If so, how can I specify a packet type to it?
3. Does anyone here know how to specify HomePlug in shorewall?
Google hasn't helped much, nor has the Shorewall website, so I hope someone here has experience of this.
Have you seen this regarding the specific ethertypes:
https://superuser.com/questions/1574757/unknown-ethertypes-0x88e1-and-0x8912 -from-my-fritz-box
Sadly I don't know anything about Shorewall, but you can look at configuring netfilter with some additional hand-crafted rules to drop the above ethertypes without logging them.
However, what I would prefer to do in your circumstances is find if your router is supported by OpenWRT firmware and configure SQM with FQ-Codel in
it to manage bufferbloat. I expect this should improve your streaming
better than whatever AVM have configured in the box.
I hope I'm not facing a complete rehash of firewall config. If so, I may return the old modem-router to service instead.
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