About a year ago I started with Centuryling, with a bonded DSL service (20/3 Mbps). They gave me a C2000T modem. After I switched, I noticed that I had some issues with Windows updates (many of them would fail), but I didn't worry too much about it. Later I set the modem into "transparent mode", but that didn't help either. Recently I made an interesting discovery. I thought that perhaps there were signals on the line that shouldnt be there And I thought that I could perhaps filter them out. The filtre I put on actually blocked one of the DSL lines, so my speed dropped to half BUT the data corruption was gone. Subsequently I changed the mtu on my Netgear router to 1400, but that has not improved things.
So, I am in a situation where I can have half speed and no data corruption, or full speed with issues. Centurylink tested my line to their switch and even istalled new "bonding blocks" (??) at my house, but that didn't change anything. So I am back to playing with my devices. The fact that when I block one DSL line everything works fine (i.e., I change something between the incoming line and the modem) seems to indicate to me that it is a setting in the modem. So I have a couple of questions:
1) tagged vs. untagged: When I put my modem in bridging mode I have 3 options: bridging mode, bridging mode tagged-0, bridging mode untagged. Right now I am using it in plain "bridging mode" and it works as described. When I put it in "bridging mode-0" my router does not seem to get through (no connection). What are the differences between these modes, and which one should I use?
2) I assume that the mtu I set on my router is the one that is being used to transmit data, and I don't need to set any mtu on the bridged modem, right? If I do, where do I do that in bridged mode? And would reducing the mtu further than 1400 possibly resolve my data corruption issue? What is a safe number to try?
Any other suggestions I can try?
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