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Forum Discussion
¿ VLAN Path between Cablemodem (Unitymedia Connect Box) and Router (Fritz! Box 7590) ?
Hello,
we operate the Fritz! Box 7590 and the Vodafone cable modem (Unitymedia) Connect Box so that the Fritz! Box is located where our telephone connection was, so that ISDN can be made available from there and WLAN has a good start-location,
The Vodafone cable modem (Unitymedia) Connect Box, on the other hand, is located in an HF-proof switch cabinet and is connected via fiber optics.
The Vodafone cable modem (Unitymedia) Connect Box is in bridge mode, in order to be really just a modem and so the FritzBox is really the device that is assigned our static IP4 number by Vodafone.
It has been working like this for many years, it was basicly still installed in the days of the Bundespost and the HF-tight outer box in which the cable modem is located also came from them.
When Unitymedia was taken over by Vodafone, a new cable modem came along and with it the number of packet losses skyrocketed. (That Problem is solved, but the Idea of a VLAN (transporting Modem2Router-Connection and LAN) passing the optical fiber remails.)
In order to be able to measure for myself whether it is due to the complex technology between the cable modem and the FritzBox (Ethernet cable, 10Mbite / sec hub with AUI port, AUI cable, fiber optic cable, 10Mbit / sec media converter, Ethernet cable) I wanted to turn this route into VLAN on top of that in order to have a Netgear Ethernet Smart Switch (GS108Tv3) on the outside and one on the inside and thus to be able to test the fiber optic link for possible packet losses in a virtual LAN branch separate from the cable modem connection and to ensure that the cable modem 100Mbit / sec or 1GBit / sec as a counterpart and not the packet losses from attempts by the cable modem to communicate with the 10Mbit / sec hub at a higher bit rate.
Is a VLAN path in between the connection of "FritzBox7590" and "Connect Box in bridge mode" possible and if so: how?
My preliminary attempt with only one Smart Switch (GS108Tv3) and a VLAN set up there (one VLAN ID for the administration branch of the GS108Tv3, another VLAN ID for those 2 ports of the connection between the cable modem and FritzBox) through which the packets should run between FritzBox and cable modem failed, but why.
Many many thanks
Karl
11 Replies
Hello Karl,
AUI - cool, feels like lte 1970ties when i was young 8-)
A little bit unclear what you are behind a VLAN - is the plan to run two networks over one fiber (?) or copper (?) link?
Grüsse
-Kurt
Yes, i plan to run two (or more) Networks over the Optical Fiber,
and it would be extremely difficult to install a second fiber optic cable.
_Karl_ wrote:
Is a VLAN path in between the connection of "FritzBox7590" and "Connect Box in bridge mode" possible and if so: how?
My preliminary attempt with only one Smart Switch (GS108Tv3) and a VLAN set up there (one VLAN ID for the administration branch of the GS108Tv3, another VLAN ID for those 2 ports of the connection between the cable modem and FritzBox) through which the packets should run between FritzBox and cable modem failed, but why.Still digging in the dark, leaving alone where and how ths devices mentioned are conneced to a fiber.
Trying to sketch a picture here.
If you intend to run multiple networks over this fiber connection (wild guess some copper<->fiber converters are in the game), the fiber has to carry two networks in the from of two VLANs (so called a trunk), where either both VLANs are tagged, or one is untagged, and the other one is tagged. Guessing again this is currently done by this single GS108Tv3.For the "WAN" connection path, two ports configured like VLAN A untagged/PVID A, optional one for the management network VLAN B/PVID B if desired.
Now on the other side of this fiber link (or copper after another converter), the trunk must be "split" for the two networks again. So here anther switch is required. On one hand a port configured as the trunk (similar to the other end), and one port for each network (like one for VLAN A untagged/PVID A, and one for VLAN B/PVID B)
As it is:
LAN
|
FritzBox as Router, that gets the IP4 assigned by the Internetprovider
|
Mediaconverter
|
Optical Fiber
|
Mediaconverter
|
Cablemodem
|
Internet
As it is shall grow
LAN__________________________________________________________
| |
FritzBox as Router, that gets the IP4 assigned by the Internetprovider |
| ________________________________________________________|
| Vm | Vl
GS108Tv3 No2
|Trunk
Mediaconverter
|
Optical Fiber
|
Mediaconverter
|Trunk
GS108Tv3 No1
| Vm | Vl
| |_________________LAN
|
Cablemodem
|
Internet
The Test-Step that failed, showing the Problem that first has to be solved
LAN__________________________________________________________
| |
FritzBox as Router, that gets the IP4 assigned by the Internetprovider |
| ________________________________________________________|
| Vm | Vl
GS108Tv3 No1
| Vm
Mediaconverter
|
Optical Fiber
|
Mediaconverter
|
|
Cablemodem
|
Internet
Vm and Vl stands for the VLANs:
Vm = modem-router connection
Vl = local, including administartion of the GS108Tv3
My Guess is that the Cablemodem already uses a VLAN-ID
and so the connection is dropped, because i don't know whats
the Number and so the GS108Tv3 was not assigned to it.Keep the Vm VLAN untagged on the trunk port(s) and on the "access" port(s).
Unlikely the Internet does come tagged from the modem, for IPTV and telephony this might be different. A potential internet VLAN config should be visible in the Fritz config in case. To figure out a potential tagged VLAN usage for the Unitymedia cablemodem, look into a Unitymedia customer forum....
How are the VLANs and the ports to connect the cable modem on the test setup (and the final with two switches) configured?
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