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FrameRelay over E1

FrameRelay-over-E1 Daemon (FRED)

Intro

  • Gateway software to run on on-site E1 connection (see artice E1/T1 Interface)
  • Bridges IP packets between Linux kernel and FrameRelay over E1
  • Suitable to connect Motorola EBTS (can be used instead of Cisco routers with E1 card installed)
  • Supports FRF.12-inner fragmentation for incoming traffic on IP bridges (Frame Relay -> Linux)
  • Implements basic DCE-PVC LMI with support of Q.933-A, ANSI T1.617-D, GOF (automatic detection)
  • Debian 12 arm64 or amd64, tested on Raspberry CM4

Configuration

Default configuration file is /opt/FRED/default.env

#
# Parameters for FRED binary
#

# E1D interface and line in format <interface number>.<line number>
FRED_LINE=0.0

# E1 slot list in format <first slot>-<last slot>
FRED_SLOT_LIST=1-15

# FrameRelay feature list in format <option>[,...]
# FRF.12-OUTER - outer frame sequence counting and fragmentation (not supported yet)
FRED_FEATURE_LIST=

# DLCI list in format <DLCI>:<type>[,...]
# LMI-DCE-PVC
# IP - IPv4 bridge
FRED_DLCI_LIST=0:LMI-DCE-PVC,16:IP,17:IP

# Path to configuration script to manage IP interface configuration on up and down
FRED_SCRIPT=./dimetra.sh

#
# Parameters for dimetra.sh
#

# Zone ID
DIMETRA_ZONE=2

# Local Site ID
DIMETRA_SITE=26

# FrameRelay DLCIs
DIMETRA_DLCI_PRIMARY=16
DIMETRA_DLCI_SECONDARY=17

# When set, routes will be added to FRR's OSPF prefix list
FRR_PREFIX_LIST=dimetra

dimetra.sh

dimetra.sh is a network auto configuration script, that FRED can run when TUN interfaces up and down. It requires following packages:

apt install php-cli frr

Multiple instances

You can have several separated systems connected to a local Linux system. For such case you need to have several .env files for each configuration. use sudo ./setup.sh install to register all instances.

Also it's possible to run FRED in command line - sudo ./run.sh <configuration.env>

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