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Configuring Secure Shell (SSH)
Configuring the Switch for SSH Operation
Refer to “5. Configuring the Switch for SSH Authentication” on page 4-18.
SSH Client Contact Behavior. At the first contact between the switch and
an SSH client, if you have not copied the switch’s public key into the client,
your client’s first connection to the switch will question the connection and,
for security reasons, give you the option of accepting or refusing. As long as
you are confident that an unauthorized device is not using the switch’s IP
address in an attempt to gain access to your data or network, you can accept
the connection. (As a more secure alternative, you can directly connect the
client to the switch’s serial port and copy the switch’s public key into the client.
See the following Note.)
Note When an SSH client connects to the switch for the first time, it is possible for
a "man-in-the-middle" attack; that is, for an unauthorized device to pose
undetected as the switch, and learn the usernames and passwords controlling
access to the switch. You can remove this possibility by directly connecting
the management station to the switch’s serial port, using a show command to
display the switch’s public key, and copying the key from the display into a
file. This requires a knowledge of where your client stores public keys, plus
the knowledge of what key editing and file format might be required by your
client application. However, if your first contact attempt between a client and
the switch does not pose a security problem, this is unnecessary.
To enable SSH on the switch.
1. Generate a public/private key pair if you have not already done so. (Refer
to
“2. Generating the Switch’s Public and Private Key Pair” on page 4-10.)
2. Execute the ip ssh command.
To disable SSH on the switch, do either of the following:
Execute no ip ssh.
Zeroize the switch’s existing key pair. (page 4-11).
Syntax: [no] ip ssh
Enables or disables SSH on the switch.
[key-size < 512 | 768 | 1024 >] Version 1 only
The size of the internal, automatically generated key
the switch uses for negotiations with an SSH client. A
larger key provides greater security; a smaller key
results in faster authentication (default: 512 bits).
4-16
- HP Procurve Series 4100GL 3
- Switches 3
- 2 TACACS+ Authentication 6
- Getting Started 13
- Introduction 14
- Command Syntax Conventions 16
- Simulating Display Output 16
- Related Publications 17
- Sources for More Information 20
- Need Only a Quick Start? 21
- Menu: Setting Passwords 26
- TACACS+ Authentication 29
- Software 31
- Release G.05. xx 31
- Terminology Used in TACACS 32
- Applications: 32
- General System Requirements 33
- Privilege Levels 35
- Before You Begin 37
- Configuration 38
- Caution Regarding 41
- Login Primary 41
- Note on 44
- Encryption Keys 44
- First-Choice TACACS+ Server 46
- How Authentication Operates 48
- Local Authentication Process 50
- Using the Encryption Key 51
- Access When Using TACACS+ 52
- Authentication 52
- Messages Related to TACACS+ 53
- Preparation: 59
- Want RADIUS To Protect 62
- The switch now 63
- SSH authentication 63
- Access When Using RADIUS 69
- IP address: 10.33.18.151 73
- Stop-Only: 75
- Start-Stop: 75
- Viewing RADIUS Statistics 77
- RADIUS Accounting Statistics 80
- Prerequisite for Using SSH 88
- Public Key Formats 89
- Host Public 96
- Key for the 96
- Bit size 97
- Exponent <e> 97
- Modulus <n> 97
- Client Contact Behavior 99
- Execute no ip ssh 100
- Public-Key Authentication 106
- Bit Size Exponent 107
- <e> 107
- Modulus 107
- <n> 107
- Comment 107
- Key Index 109
- Contents 113
- Overview 114
- Terminology 115
- Prerequisite for Using SSL 116
- Operation 119
- Password 120
- Security Tab 120
- Show host certificate 124
- Current SSL 127
- Host Certificate 127
- Browser Contact Behavior 129
- Enable SLL 132
- Common Errors in SSL setup 133
- (802.1x) 135
- Overview 136
- How 802.1x Operates 139
- as defined in the 142
- 802.1x standard 142
- Access Control (802.1x) 145
- Authenticators 148
- 802.1x Open VLAN Mode 154
- 802.1x Open VLAN Mode 155
- Unauthorized-Client VLANs 158
- 802.1x Devices 165
- Blocking a Non 166
- 802.1x Device 166
- Other Switches 167
- Statistics, and Counters 171
- The switch reboots 176
- After the 802.1x session 180
- Basic Operation 184
- • PC1 can access Switch A 186
- Planning Port Security 187
- Configuring Port Security 192
- Security Features 197
- Alert Flags 197
- Resetting Alert Flags 199
- Yes” for the port on which 201
- Options 209
- Access Levels 209
- Stations 210
- Managers 211
- Building IP Masks 215
- IP Entry 216
- Operating Notes 218
- Using Authorized IP Managers 219
- Index – 1 221
- 2 – Index 222
- Index – 3 223
- 4 – Index 224
- Index – 5 225
- 6 – Index 226
- 5990-3032 228
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