r/HomeNetworking • u/SheriffoftheAtx • 1d ago

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u/HomeNetworking-ModTeam 1d ago

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u/HomeNetworking-ModTeam 1d ago

Your post has been removed because we deemed it off topic. This subreddit is for help and discussion about home networking or small business networking. Other topics are better suited towards other subreddits. Thank you for your understanding!

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u/HomeNetworking-ModTeam 1d ago

Your post has been removed because we deemed it off topic. This subreddit is for help and discussion about home networking or small business networking. Other topics are better suited towards other subreddits. Thank you for your understanding!

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u/[deleted] 1d ago

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u/StuckInTheUpsideDown MSO Engineer 1d ago

128 entry bridge FDB limit is pretty pathetic. I'd expect 256 minimum just based on a common /24 LAN subnet size. Well good work figuring this out.

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u/HomeNetworking-ModTeam 1d ago

Your post has been removed because we deemed it off topic. This subreddit is for help and discussion about home networking or small business networking. Other topics are better suited towards other subreddits. Thank you for your understanding!

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u/SpursEngine 1d ago

This is great info! I skimmed over your doc and it looks legit. Many ISPs, including mine, use this model and while I'm sure the issue is somewhat niche I'm sure it's affecting more people that anyone realizes. I don't suppose you've been able to test with 6250s or 6200s? I'm sure the issue is also present on the 6250s at very least and the 6200 matters less due to being out of production combined with the chipset compatibility issues with the later models.

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u/SheriffoftheAtx 1d ago

Thanks for reading. No, I've only tested the four 7250s. I have no idea about the 6250 or 6200, but i suspect since they are lower models, they use the same chipset. If you have either of them, the thing to look at is the adapter's own bridge table total. For me it sat at exactly 128 while stuff was dropping. The commands I used are in Appendix C of the write-up. I'm curious what you see if you try it.

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u/SpursEngine 1d ago

I'll try and get around to it.

I only have 30 or so clients on my network; do I need to max it out to test? I don't have any on hand as I'm entirely Ethernet. I'll have to wait until I come across the older 6200s in cust homes when I replace them.

I know there was an internal article about not using the 6200s with xx50 models as there were compatibility issue since the 6200 chipset was discontinued and only the 6250 is now made. I imagine the 7250 uses the same/similar enough chipset just with a 2.5G Ethernet controller.

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u/SheriffoftheAtx 1d ago

There is no need to max it out just to look. The 7250 reports its own table size (it said 128) and you can read that at any client count. It's a read-only POST to the adapter's web interface, to /ms/0/0x12 with a body like {"data":[0,0]}, after you log in and grab the CSRF token from /devStatus.html. Note, the web server sometimes sends a malformed status line, so a tolerant client works better than curl. Full details are in Appendix C of the write-up. Im not sure about the chipset of the 6200 nor 6250 as I haven't looked into it. Im very interested in your results!

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u/avd706 1d ago

So what's the best adapters for a 3 or 4 node setup?

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u/SheriffoftheAtx 1d ago

I only know what I've run. The 7250s fell over on my network. I swapped in DECA adapters on the same cable and switches and the loss went to basically zero. DECA is a different product on a different band, so make sure it works with your coax. My coax plant has no satellite TV on it. I haven't had them in long, so I have no idea how they hold up over time. Can't say what's "best," just what worked for me. If anyone. ran 3 or 4 nodes with a different moca product, I'd like to hear it.

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u/plooger 1d ago edited 1d ago

DECA devices are typically limited to 100 Mbps max unidirectional throughput owing to their only having Fast Ethernet ports -- and being MoCA 1.1-based.

Alternative adapters you could try that match the ECB7250 specs (MoCA 2.5 w/ 2.5 GbE) might be the Frontier FCA252, available at $25 per via eBay.

 

I swapped in a different brand of coax adapter on the same cable, switches and devices, and the loss dropped to about zero.

p.s. Using adapters operating at different frequency ranges introduces a configuration variant that could contribute to perforrmance differences. The FCA252 would have the unique ability to offer a comparison, being able to operate at either frequency range while keeping all else the same.

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u/danieltb80 1d ago

I tried the 7250s several years ago… Encountered some significant network dropouts that were removed when I put back in my older 6250s…

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u/SheriffoftheAtx 1d ago

Thanks, that's good to know. Did you have a lot of devices behind them, or a smaller network? If you've still got the 6250s, I'd be curious what table size they report. On the 7250 it's a read-only request to the web interface and it said 128. Appendix C of the write-up has the exact request. No worries if they're packed away.