Cisco Cisco IOS Software Release 12.4(2)XB6

Cisco 1841

The 3G wireless WAN HWIC provides broadband WAN connectivity using high speed cellular data 
technology and it supports the following GSM and CDMA technologies:

High-speed Downlink Packet Access (HSDPA)

Universal Mobile Telecommunications System (UMTS)

Enhanced Data-Rates for GSM Evolution (EDGE)

General Packet Radio Service (GPRS)

Evolution-Data Optimized (EVDO)

1 times Radio Transmission Technology (1xRTT)

Automatic best network selection

Multiple external antenna options

Static and dynamic IP addressing

Modem-based support for mobile IP

Cellular interface based on the async interface in Cisco IOS

NAT support

Security features like Firewall, IDS/IPS and IPSec VPN on the router

WAN switchover using IOS backup interface feature

There are no new software features for this release.

For information regarding the features supported in Cisco IOS Release 12.4T, see the Cross-Platform 
Release Notes and New Feature Documentation links at the following location on 

Caveats describe unexpected behavior or defects in Cisco IOS software releases. Severity 1 caveats are 
the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious 
of these three severity levels.

Caveats in Cisco IOS Release 12.4(4)T are also in  Release 12.4(11)XV. For information on caveats in 
Cisco IOS Release 12.4T, see the 

Caveats for Cisco IOS Release 12.4(4)T

 document. This document 

lists severity 1 and 2 caveats; the documents are located on 

.

If you have an account on Cisco.com, you can also use the Bug Toolkit to find select caveats of any 
severity. To reach the Bug Toolkit, log in to 

 and go to: 

.