IES-1248-51V User’s Guide
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H A P T E R
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DHCP Relay
This chapter shows you how to set up DHCP relays for each VLAN.
28.1 DHCP Relay
DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows
individual clients to obtain TCP/IP configuration at start-up from a DHCP server.
You can configure the IES-1248-51V to relay DHCP requests to one or more DHCP
servers and the server’s responses back to the clients.You can configure the
system to forward client DHCP requests from different VLANs to specific DHCP
servers.
28.2 DHCP Relay Agent Information Option
(Option 82)
The IES-1248-51V can add information to DHCP requests that it relays to a DHCP
server. This helps provide authentication about the source of the requests. You can
also specify additional information for the IES-1248-51V to add to the DHCP
requests that it relays to the DHCP server. Please see RFC 3046 for more details.
The DHCP relay agent information feature adds an Agent Information field to the
option 82 field of the DHCP headers of client TCP/IP configuration request frames
that the IES-1248-51V relays to a DHCP server. The IES-1248-51V supports two
formats for the DHCP relay agent information: Private and TR-101.
28.2.1 Private Format
The DHCP relay agent information feature adds an Agent Information field to the
option 82 field of the DHCP headers of DHCP request frames that the device relays
to a DHCP server. The Agent Information field that the device adds contains an
“Agent Circuit-ID sub-option” that includes the slot and port numbers, VLAN ID
Summary of Contents for IES-1248-51A
Page 2: ......
Page 8: ...Safety Warnings IES 1248 51V User s Guide 8...
Page 11: ...Contents Overview IES 1248 51V User s Guide 11 Appendices and Index 593...
Page 12: ...Contents Overview IES 1248 51V User s Guide 12...
Page 32: ...Table of Contents IES 1248 51V User s Guide 32...
Page 34: ...34...
Page 46: ...Chapter 1 Introducing the IES 1248 51V IES 1248 51V User s Guide 46...
Page 52: ...Chapter 2 Hardware Installation IES 1248 51V User s Guide 52...
Page 60: ...Chapter 3 Front Panel Connections IES 1248 51V User s Guide 60...
Page 64: ...Chapter 4 MDF Connections IES 1248 51V User s Guide 64...
Page 66: ...Chapter 5 Power Connections IES 1248 51V User s Guide 66...
Page 70: ...70...
Page 88: ...Chapter 8 Tutorials IES 1248 51V User s Guide 88...
Page 96: ...Chapter 9 Home and Port Statistics Screens IES 1248 51V User s Guide 96...
Page 116: ...Chapter 14 IP Setup IES 1248 51V User s Guide 116...
Page 138: ...Chapter 16 xDSL Port Setup IES 1248 51V User s Guide 138...
Page 162: ...162...
Page 186: ...Chapter 20 IGMP IES 1248 51V User s Guide 186...
Page 198: ...Chapter 23 Packet Filtering IES 1248 51V User s Guide 198...
Page 208: ...Chapter 25 Spanning Tree Protocol IES 1248 51V User s Guide 208...
Page 214: ...Chapter 26 Port Authentication IES 1248 51V User s Guide 214...
Page 222: ...Chapter 28 DHCP Relay IES 1248 51V User s Guide 222...
Page 228: ...Chapter 29 DHCP Snoop IES 1248 51V User s Guide 228...
Page 246: ...Chapter 32 DSCP IES 1248 51V User s Guide 246...
Page 258: ...Chapter 34 ACL IES 1248 51V User s Guide 258...
Page 262: ...Chapter 36 Syslog IES 1248 51V User s Guide 262...
Page 272: ...Chapter 37 Access Control IES 1248 51V User s Guide 272...
Page 300: ...Chapter 40 Maximum MTU Size IES 1248 51V User s Guide 300...
Page 306: ...306...
Page 354: ...Chapter 47 Diagnostic IES 1248 51V User s Guide 354...
Page 358: ...Chapter 48 MAC Table IES 1248 51V User s Guide 358...
Page 362: ...362...
Page 376: ...Chapter 51 Common Commands IES 1248 51V User s Guide 376...
Page 392: ...Chapter 53 Alarm Commands IES 1248 51V User s Guide 392...
Page 404: ...Chapter 54 DHCP Commands IES 1248 51V User s Guide 404...
Page 408: ...Chapter 55 OUI Filter IES 1248 51V User s Guide 408...
Page 418: ...Chapter 56 IEEE 802 1Q Tagged VLAN and Isolation Commands IES 1248 51V User s Guide 418...
Page 423: ...Chapter 57 MAC Commands IES 1248 51V User s Guide 423...
Page 424: ...Chapter 57 MAC Commands IES 1248 51V User s Guide 424...
Page 436: ...Chapter 58 IGMP Commands IES 1248 51V User s Guide 436...
Page 440: ...Chapter 59 Packet Filter Commands IES 1248 51V User s Guide 440...
Page 446: ...Chapter 60 Switch and Statistics Commands IES 1248 51V User s Guide 446...
Page 510: ...Chapter 64 ADSL Commands IES 1248 51V User s Guide 510...
Page 514: ...Chapter 65 G Bond IES 1248 51V User s Guide 514...
Page 540: ...Chapter 67 ACL Commands IES 1248 51V User s Guide 540...
Page 555: ...Chapter 68 VoIP Commands IES 1248 51V User s Guide 555...
Page 578: ...Chapter 70 Troubleshooting IES 1248 51V User s Guide 578...
Page 593: ...593 PART VI Appendices and Index Changing a Fuse 595 Index 645...
Page 594: ...594...
Page 596: ...Appendix A Changing a Fuse IES 1248 51V User s Guide 596...
Page 644: ...Appendix B PSTN Parameters by Country IES 1248 51V User s Guide 644...