Appendix A: Local transport requirements
Confirm the following router/switch settings prior to
activating your AT&T MetroCell:
•
DHCP
is
ON
•
MTU size
is set to
1492
•
MAC address filtering
is either
turned off
or allows the
MAC address of the MetroCell
•
IPSec Pass-Through
is
Enabled
•
Block Fragmented Packets
is
Disabled
If using multiple routers, the MetroCell must be connected
to the first router connected to the broadband modem.
If the MetroCell is connected to a router that is connected
to a modem and both the router and the modem have NAT
(Network Address Translation) enabled, disable NAT either
in the router or the modem.
TCP/UDP Ports
All ports listed need to be Open for inbound and outbound
connections:
− UDP Ports 123, 500, 4500, 33434, 33435, 33436
− TCP Ports 443, 7004, 7014
IP Address Pass-Through
If the local network has a firewall with specific IP addresses
allowed to pass through, the following addresses must be
allowed to pass:
Port
IP Addresses
TCP 443, 7004, 7014:
166.147.105.25
UDP 123:
12.230.208.133
12.230.209.5
12.230.208.48
12.230.209.133
UDP 500, 4500, 33434,
33435, 33436:
12.230.209.81
12.230.209.161
12.230.209.225
12.230.209.17
12.230.208.25
12.230.208.81
12.230.208.209
12.230.208.145
In addition, no traffic to or from the following URLs should
be blocked:
fileserver.metro.wireless.att.com
hnm.metro.wireless.att.com
initial-ipsecrouter.metro.wireless.att.com
Appendix B: Bandwidth guidelines
Customer is responsible for providing connectivity to the
Internet.
The required bandwidth will depend on the number of
simultaneous users you want to be able to support and
whether data-intensive applications are being used.
The maximum total traffic that can be carried by a MetroCell
across all simultaneous users, based on its radio interface, is:
• 5.6 Mbit/sec. from handsets to the MetroCell (uplink)
• 21 Mbits/sec. from the MetroCell to handsets (downlink)
Each simultaneous voice call requires 37 Kbit/sec. of
bandwidth on the Internet access connection.
A full complement of 32 simultaneous voice calls would
require 1.2 Mbit/sec.
If some of these user sessions are high-volume data sessions
instead of voice calls, the required bandwidth can be much
higher. For example, watching a streaming video can peak
above 1.5 Mbit/sec. for a single user. Data sessions tend to be
“bursty,” with fluctuating demands for bandwidth.
When voice and data sessions are competing for limited
bandwidth, priority is given to the voice calls.
Customer is responsible for taking all of these factors into
consideration in determining how much bandwidth is needed
on the Internet access connection.
In the absence of any specific information on expected
usage, it is suggested that capacity of at least 10 Mbps
down and 2 Mbps up be provided.
Inadequate bandwidth may result in dropped calls, poor
voice quality, slow response to data requests, and other
adverse effects. If you experience any of these, you may
need to increase the available bandwidth or remove other
traffic.
AT&T MetroCell User Guide •
February 2016
8
