User`s guide

X.25 PACKET SWITCHING .................................................................................. 460

Introduction ...................................................................................................... 460

B-channel X.25 .................................................................................................. 460

D-channel X.25 .................................................................................................. 460

X.28 Commands ................................................................................................ 461

PPP OVER ETHERNET .......................................................................................... 469

IPSEC AND VPNS ................................................................................................ 470

What is IPSec? .................................................................................................. 470

Data Encryption Methods .................................................................................... 470

What is a VPN? .................................................................................................. 471

The Benefits of IPSec .......................................................................................... 471

X.509 Certificates .............................................................................................. 472

FIREWALL SCRIPTS ............................................................................................ 474

Introduction ...................................................................................................... 474

Firewall Script Syntax ......................................................................................... 474

Specifying IP Addresses and Ranges ..................................................................... 479

Address/Port Translation ..................................................................................... 481

Filtering on Port Numbers .................................................................................... 481

Filtering on TCP Flags ......................................................................................... 482

Filtering on ICMP Codes ...................................................................................... 483

Stateful Inspection ............................................................................................. 484

The FWLOG.TXT File ........................................................................................... 489

Debugging a Firewall .......................................................................................... 493

REMOTE MANAGEMENT ...................................................................................... 494

Using V.120 ...................................................................................................... 494

Using Telnet ...................................................................................................... 494

Using FTP ......................................................................................................... 495

Using X.25 ........................................................................................................ 496

AT COMMANDS ................................................................................................... 497

D Dial ............................................................................................................... 497

H Hang-up ........................................................................................................ 497

Z Reset ............................................................................................................ 497

&C DCD Control ................................................................................................. 498

&F Load Factory Settings .................................................................................... 498

&R CTS Control .................................................................................................. 498

&V View Profiles ................................................................................................. 498