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C6300 v2, port 22 blocked while in DMZ
Cable modem with wifi router model C6300 v2 firmware v1.03.06. IP version 6 firewall disabled. Tested from outside that port forwarding of 22 and 80 works OK when set up through port forwarding. ...
I had thought I was going to save a slot on the power strip by combining functions, but I just learned the hard way that the combined modem + router is not worth the hassles. Separate devices makes it easier to upgrade/swap each function independently.
I expect Netgear should publish these gotchas so a purchaser can have an idea of non-typical DMZ implementation (purposeful block of ports 22 and 23). I am to the point of it being worthwhile to purchase low-end commercial gear for residences. The debug hours on the consumer grade gear quickly tears through any savings on the purchase price.
Well I presume the DMZ issue is a flaw on there code and was never addressed since nobody complained about it as we haven't see anyone else post about this issue. The modem is going on 7 years old and NG probably decided that there wasn't alot of traction on this one problem that probably not going to fix it.
Ya these combo units are ok but do bring out odd problems, especially when ISPs are responsible for FW updates that user dont have access to, so theres a big hassel there if something goes wrong there. Personally I prefer separate units that way I can control what happens on the external router side. As long as the modem unit is working and the ISP is keeping that going, found thats the best way to run modem and external routers.
Good luck.