T-Home (VDSL) with Cisco 1812W (IGMP proxy configuration)

Unanswered Question
Oct 11th, 2007


I have some problems configuring the Cisco 1812 as IGMP proxy.

I have found instructions for configuring linux as router that handles the IGMP traffic. The config file for the IGMP-proxy in Linux looks like this:


# upstream = Internet Device

phyint ppp0 upstream ratelimit 0 threshold 1



# IP of Set-Top-Box


# eth0 LAN-Interface

phyint eth0 downstream ratelimit 0 threshold 1

# other devices are deactivated

phyint eth1 disabled

phyint eth1.7 disabled

hyint lo disabled

Additionally the follwing commands need to be executed:

iptables -I FORWARD -s -d -j ACCEPT

iptables -I FORWARD -s -d -j ACCEPT

iptables -I INPUT -d -j ACCEPT

iptables -I FORWARD -d -j ACCEPT

Maybe you can help me converting this configuration for the 1812W (12.4)

Alexander Crusius

I have this problem too.
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xymososx Wed, 10/17/2007 - 13:17

hi Alexander,

sorry i cant help you. but i hope that you can help me :)

I run also VDSL from the Telekom. But i cant find andy instructions to configure my Cisco Router right for VDSL. I find some infos about the PPPOe auth ( VLAN 7 tag )

Can ypu pst your Dialer Config for me ?

Thats would be great !

Supports IOS 12.3.x VDSL ? And wich platform is needet ?

Very Thanks


byterunner Thu, 10/18/2007 - 05:49

Dear Vadim,

I'm using a switch to remove the VLAN tag for the Cisco Router and to tag the outgoing traffic with VLAN 7. Unfortunately I couldn't figure out how to configure PPPoE with VLAN tagging until today. I have found this document that describes the procedure: http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_feature_guide09186a00801a8b6c.html

I will try to use this and if I suceed I will post the configuration.



xymososx Thu, 10/18/2007 - 06:07

hi Alex,

Thats sound like a good idea :)

Let me know if youre finish.

Is your Router online ? ( With VDSL !?! )

I used the Cisco Feature Navigator - but i couldt find infos thats supports your 18xx the IGMP Proxy function. Only "UDLR Tunnel ARP and IGMP Proxy ".

best reagards


byterunner Fri, 10/19/2007 - 00:05

Hi Vadim,

I still didn't find the time to try the new configuration.

Currently my router works just fine with the little trick. Performance is excellent (50Mbit/sec).

As far as I know the router should support IGMP proxying, I already played around with it and it also shows some IGMP groups. I think the problems is that the firewall blocks some traffic. Maybe I have some time this weekend.



xymososx Mon, 10/22/2007 - 06:33

Hi Alex,

Can you please post your configuration

( Complete )? Thats would be great. Wich little Trick ? :)

I find this example for an 1802 Router:

vpdn enable

interface FastEthernet8

description WAN to VDSL-Modem

switchport access vlan 7

switchport mode trunk

interface Vlan7

no ip address

pppoe enable group global

pppoe-client dial-pool-number 11

interface Dialer11

description PPPoE to T-Online

ip address negotiated

encapsulation ppp

load-interval 30

dialer pool 11

dialer-group 1

ppp authentication pap callin

ppp pap sent-username Anschlusskennung+T-Online-Nummer# - eMail Adresse aus Sicherheitsgründen entfernt - password XXX

ppp ipcp dns request

But i dont cant use it :(

"switchport" is not support on my 2621 - i mean...

I have also a Catalyst 2950T. Can i create a VLAn 7 on the Catalyst - and then i plug my Modem on the Switch ? And The PPPoe neog. Comes "normal" from the Router ?

byterunner Mon, 10/22/2007 - 10:00


The trick is removing the VLAN tag in the switch into the direction to the router and tagging it back to the modem. Then you can just configure the PPPoE connection as usual.

Unfortunately I'm so busy this moment that I can't play around with the other solution.

So my configuration is nothing special right now.




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