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Chapter A Networking Concepts
Access Lists
A-8
Cisco 1700 Series Router Software Configuration Guide
78-5407-03
PAP Authentication
Like CHAP, PAP is an authentication protocol used with PPP. However, PAP is
less secure. CHAP passes an encrypted version of the password on the physical
link, but PAP passes the password and host name or username in clear text.
When interactive mode (rather than dedicated mode) is used on asynchronous
lines, the username command allows a router to verify a username in an internal
database before the user can call in to the router. In the following example, user
Joe Smith is allowed to call in to the router if he uses the password “freedom”:
username JoeSmith password freedom
line 1
login
Access Lists
Access lists control packet filtering on Cisco routers by limiting traffic and
restricting network use by certain users or devices. Although there are several
purposes for using access lists, the configuration examples in this guide use access
lists to control the transmission of packets on a specific interface.
An access list is a sequential collection of “permit” and “deny” conditions that
apply to network addresses. Packet addresses are compared to the conditions in
all access lists configured in the router. The first match determines whether the
packet is accepted or denied by the router. Because the router stops testing
conditions after the first match, the order in which the conditions are defined in
the access list is critical. If a packet does not match any conditions configured in
an access list, the router rejects the packet.
For detailed information on how access lists work and how to configure them,
refer to the “Configuring IP Services” chapter in the Network Protocols
Configuration Guide, Part 1, publication, which is available on the
Documentation CD-ROM that came with your router.
- Cisco Reader Comment Card 1
- General Information 1
- Document Information 1
- Mailing Information 1
- BUSINESS REPLY MAIL 2
- Configuration Guide 3
- CONTENTS 5
- 3 Miscellaneous Features 3-1 6
- 5 Configuring ISDN 5-1 7
- 7 Configuring Frame Relay 7-1 9
- Contents 10
- 78-5407-03 10
- 9 Configuring X.25 9-1 11
- A Networking Concepts A-1 12
- B ROM Monitor B-1 12
- Objectives 15
- Audience 15
- Organization 16
- Conventions 17
- Related Documentation 18
- Obtaining Documentation 18
- Ordering Documentation 19
- Documentation Feedback 19
- Cisco.com 20
- Technical Assistance Center 20
- Cisco TAC Web Site 21
- Cisco TAC Escalation Center 22
- Understanding Command Modes 24
- Getting Help 28
- Entering Configuration Mode 30
- Using Commands 31
- Saving Configuration Changes 32
- Using Debug Commands 33
- Where to Go Next 34
- Configuring Security Features 35
- Configuring IP Security 36
- Disabling Hardware Encryption 37
- Configuring Firewalls 39
- Configuration Examples 41
- Inspection Rules 42
- Miscellaneous Features 43
- Configuration Example 44
- • VLAN Commands 49
- Enabling IP Routing 50
- Enabling NetWare Routing 52
- Configuration 53
- VLAN Commands 54
- Usage Guidelines 56
- Syntax Description 56
- Command Mode 56
- Configuring ISDN 59
- Router# ping 192.168.37.40 73
- Troubleshooting 74
- Configuring IPX Routing 91
- Clearing the ISDN Interface 93
- Dial-In ISDN BRI Pool 100
- Configuring EIGRP Routing 103
- Command Task 105
- Configuring a Leased Line 107
- Before You Begin 108
- Configuring Global Parameters 109
- Configuring Security 109
- Verifying Your Configuration 112
- Configuring Frame Relay 117
- Frame Relay 118
- • debug ppp authentication 145
- • debug ppp multilink events 145
- Configuring Routing Protocols 155
- Floating Static Routes 156
- Assumptions 157
- Configuring Asynchronous 169
- Connections 169
- Asynchronous Dial-In Pool 180
- Configuring X.25 187
- X.25 over ISDN B Channel 196
- X.25 over ISDN D Channel 206
- Troubleshooting X.25 Problems 216
- Networking Concepts 217
- ISDN Components 218
- Services 219
- Sample Configuration 219
- WAN Technologies 221
- CHAP and PAP Authentication 223
- Access Lists 224
- Dialer Pools 225
- Network Address Translation 226
- Virtual LANs 227
- VLAN Issues 228
- Communicating Between VLANs 229
- Designing Switched VLANs 230
- ROM Monitor 233
- ROM Monitor Commands 235
- Command Descriptions 236
- Table 0-2 Boot Commands 237
- Required Variables 238
- Optional Variables 238
- Chapter B ROM Monitor 239
- Configuration Register 240
- Console Download 242
- Error Reporting 243
- Debug Commands 244
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