IP-tunnel and bridging
From mISDN.org
- this page is under construction -
Contents |
IP-Tunnel
Layer 1 over IP
Imagine you have some kind of ISDN card that is connected to your IP switch. Layer 1 over IP is a simple UDP protocol to transfer ISDN D-channels and B-channel over IP network. The driver behaves like you have one or more BRI or PRI interfaces. It supports:
- dynamic IP handling
- simple compression
- primary rate
- bchannels from 1-126 (for non standard PRI)
- multipoint on IP layer (not supported yet)
- channel bundeling (not supported yet)
- traffic detection for each channel.
NOTE: This protocol is not compatible with TDMoE or other equivalent tunneling protocols.
Other protocols try to transfer a complete E1 interface via IP or ethernet. This has some dissadvantages:
- always full traffic
- broadband internet required
- no compression possible
- fixed to 32 channels
- no basic rate
- no multipoint on IP layer
Module Configuration
tbd
Dynamic IP
There are three situations:
- both peers have fixed IP
- one peer has dynamic IP
- both peers have dynamic IPs
If both peers have a fixed IP, just give the IP address of the remote peer to each peer. By default, both peers will continue to transmit keepalife packets, even if the IP connection is lost. This lets each peer see, if the remote peer is available.
If one peer has dynamic IP, this peer is not known at by the peer with the fixed IP address, so it is set to 0.0.0.0. As soon as an IP packet arrives from the peer with the dynamic IP address, the peer with the fixed IP address will use this IP address from that point on. Whenever the IP address changes, the new IP address is used. It is usefull to set the 'ondemand' flag, so the peer with the fixed IP address will not continue to send keepalife data, when the peer with the dynamic IP is offline.
tbd
Card Bridging
Before Bridging
tbd
isdnbridge
tbd
