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Applicable to Version 10.01.0286 onwards
DHCP Option Objects, also known as Vendor Extensions, are used to identify the vendor and functionality of a DHCP client. The information is a variable-length string of characters or octets in the Option field of a DHCP message which has a meaning specified by the vendor of the DHCP client.
This article describes the detailed configuration of DHCP Option Objects and its application to the static or dynamic DHCP scopes in Cyberoam. The Cyberoam DHCP server options feature provides support for all DHCP option objects, i.e., 1 to 255. This feature supports the following standards:
· RFC 2131 - Dynamic Host Configuration Protocol
· RFC 2132 - DHCP Options and BOOTP Vendor Extensions Standards
For Further reference, a list of all DHCP Option Objects is given at the end of this article.
In this article, as an example, we have configured option objects 176 and 252 used by the Avaya IP phones. This configuration is to be done from Web Admin Console as well as the Command Line Interface (CLI) using Administrator profile.
Note:
The option object 252 is for private use, and it can be used interchangeably with option 172. Use of Option Object 172 and 252 is recommended.
To Configure DHCP Option Objects for Avaya IP Phones in Cyberoam, follow the steps given below.
STEP 1: Create DHCP Lease Scope
Create a DHCP lease scope named “IPPhone_DHCP” from the Cyberoam GUI.
1. Go to Network à DHCP à Server.
2. Click Add. Specify values for given parameters according to the table given below.
3. Click OK to create the new DHCP Lease Scope. It can be seen as below.
STEP 2: Configure DHCP Option 176
Configuration of DHCP Options can be done from Cyberoam’s Command Line Interface (CLI).
1. Login to CLI using Telnet/SSH.
2. Select option 4 to go to Cyberoam Console.
3. Fire the following command to add Object 176 to the list of existing DHCP Option Objects in Cyberoam.
console > cyberoam dhcp dhcp-options add optioncode 176 optionname IPTelephone optiontype string
To view the list of existing DHCP Option Objects, fire the following command
console > cyberoam dhcp dhcp-options list
Note:
Cyberoam displays the option numbers from 1 to 76 only, but it supports all the 255 option objects.
4. Bind the newly added Object 176 to the DHCP Lease Scope “IPPhone_DHCP”. The parameters and their values used in the
command fired for binding are given in the table below.
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Parameters
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Values
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MCIPADD
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192.168.30.99
IP address of the Avaya Call server. This is the server where an Avaya IP phone registers itself.
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MCPORT
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1719
Avaya IP Phone communicates with the Avaya call server on port 1719 by default. A custom port can be specified if you have it configured on your call server.
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TFTPSRVR
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192.168.30.201
The TFTP Server address to which IP Phones connect to perform automatic firmware upgrades when the Config file received by the phone has a higher version than the present file.
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The command to be executed is given below.
console > cyberoam dhcp dhcp-options binding add dhcpname IPPhone_DHCP optionname IPTelephone(176)
value ‘MCIPADD=192.168.30.99,MCPORT=1719,TFTPSRVR=192.168.30.201’
STEP 3: Configure DHCP Option 252
Here, a private Option Object 252 is added to the list of existing DHCP Option Objects.
1. Fire the following command to add DHCP Option Object 252.
console > cyberoam dhcp dhcp-options add optioncode 252 optionname httpserver optiontype string
2. Bind the newly added Object 252 to the DHCP Lease Scope “IPPhone_DHCP”. This Option Object defines only one parameter which
specifies IP of the HTTP server as the IP address of the SIP proxy and the registration server is configured in the Server itself. The parameter
and its value used in the command fired for binding are given in the table below.
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Parameters
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Values
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ConfigHttpServer
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192.168.30.102
IP address of the Http Server.
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The command to be executed is given below.
console > cyberoam dhcp dhcp-options binding add dhcpname IPPhone_DHCP optionname httpserver(252) value ‘ConfigHttpSrvr=192.168.30.102’
This is the configuration of DHCP Option Objects 176 and 252 for Avaya IP Phones. There are a number of other objects that can be used for various purposes. A list of all DHCP Option Objects is given below for reference.
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Code
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Description
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0
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Pad.
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1
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Subnet Mask.
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2
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Time Offset (deprecated).
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3
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Router.
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4
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Time Server.
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5
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Name Server.
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6
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Domain Name Server.
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7
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Log Server.
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8
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Quote Server.
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9
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LPR Server.
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10
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Impress Server.
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11
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Resource Location Server.
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12
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Host Name.
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13
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Boot File Size.
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14
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Merit Dump File.
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15
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Domain Name.
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16
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Swap Server.
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17
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Root Path.
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18
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Extensions Path.
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19
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IP Forwarding enable/disable.
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20
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Non-local Source Routing enable/disable.
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21
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Policy Filter.
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22
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Maximum Datagram Reassembly Size.
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23
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Default IP Time-to-live.
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24
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Path MTU Aging Timeout.
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25
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Path MTU Plateau Table.
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26
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Interface MTU.
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27
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All Subnets are Local.
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28
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Broadcast Address.
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29
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Perform Mask Discovery.
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30
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Mask supplier.
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31
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Perform router discovery.
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32
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Router solicitation address.
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33
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Static routing table.
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34
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Trailer encapsulation.
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35
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ARP cache timeout.
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36
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Ethernet encapsulation.
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37
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Default TCP TTL.
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38
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TCP keepalive interval.
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39
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TCP keepalive garbage.
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40
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Network Information Service Domain.
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41
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Network Information Servers.
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42
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NTP servers.
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43
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Vendor specific information.
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44
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NetBIOS over TCP/IP name server.
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45
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NetBIOS over TCP/IP Datagram Distribution Server.
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46
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NetBIOS over TCP/IP Node Type.
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47
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NetBIOS over TCP/IP Scope.
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48
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X Window System Font Server.
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49
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X Window System Display Manager.
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50
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Requested IP Address.
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51
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IP address lease time.
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52
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Option overload.
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53
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DHCP message type.
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54
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Server identifier.
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55
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Parameter request list.
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56
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Message.
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57
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Maximum DHCP message size.
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58
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Renew time value.
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59
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Rebinding time value.
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60
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Class-identifier.
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61
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Client-identifier.
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62
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NetWare/IP Domain Name.
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63
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NetWare/IP information.
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64
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Network Information Service+ Domain.
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65
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Network Information Service+ Servers.
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66
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TFTP server name.
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67
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Bootfile name.
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68
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Mobile IP Home Agent.
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69
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Simple Mail Transport Protocol Server.
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70
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Post Office Protocol Server.
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71
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Network News Transport Protocol Server.
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72
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Default World Wide Web Server.
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73
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Default Finger Server.
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74
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Default Internet Relay Chat Server.
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75
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StreetTalk Server.
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76
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StreetTalk Directory Assistance Server.
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77
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User Class Information.
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78
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SLP Directory Agent.
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79
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SLP Service Scope.
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80
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Rapid Commit.
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81
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FQDN, Fully Qualified Domain Name.
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82
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Relay Agent Information.
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83
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Internet Storage Name Service.
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84
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85
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NDS servers.
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86
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NDS tree name.
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87
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NDS context.
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88
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BCMCS Controller Domain Name list.
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89
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BCMCS Controller IPv4 address list.
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90
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Authentication.
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91
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Client-last-transaction-time.
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92
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Associated-ip.
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93
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Client System Architecture Type.
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94
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Client Network Interface Identifier.
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95
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LDAP, Lightweight Directory Access Protocol.
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96
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97
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Client Machine Identifier.
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98
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Open Group's User Authentication.
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99
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GEOCONF_CIVIC.
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100
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IEEE 1003.1 TZ String.
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101
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Reference to the TZ Database.
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102-111
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112
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NetInfo Parent Server Address.
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113
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NetInfo Parent Server Tag.
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114
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URL.
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115
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116
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Auto-Configure
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117
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Name Service Search.
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118
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Subnet Selection.
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119
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DNS domain search list.
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120
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SIP Servers DHCP Option.
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121
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Classless Static Route Option.
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122
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CCC, CableLabs Client Configuration.
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123
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GeoConf.
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124
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Vendor-Identifying Vendor Class.
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125
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Vendor-Identifying Vendor-Specific.
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126
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127
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128
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TFPT Server IP address.
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129
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Call Server IP address.
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130
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Discrimination string.
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131
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Remote statistics server IP address.
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132
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802.1P VLAN ID.
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133
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802.1Q L2 Priority.
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134
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Diffserv Code Point.
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135
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HTTP Proxy for phone-specific applications.
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136
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PANA Authentication Agent.
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137
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LoST Server.
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138
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CAPWAP Access Controller addresses.
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139
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OPTION-IPv4_Address-MoS.
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140
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OPTION-IPv4_FQDN-MoS.
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141
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SIP UA Configuration Service Domains.
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142
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OPTION-IPv4_Address-ANDSF.
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143
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OPTION-IPv6_Address-ANDSF.
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144 – 149
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150
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TFTP server address.
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150
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Ether boot. GRUB configuration path name.
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151-174
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175
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Ether boot.
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176
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IP Telephone.
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177
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Ether boot. Packet Cable and Cable Home.
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178-207
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208
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pxelinux.magic (string) = F1:00:74:7E (241.0.116.126).
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209
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pxelinux.configfile (text).
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210
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pxelinux.pathprefix (text).
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211
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pxelinux.reboottime (unsigned integer 32 bits).
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212
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OPTION_6RD.
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213
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OPTION_V4_ACCESS_DOMAIN.
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214-219
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220
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Subnet Allocation.
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221
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Virtual Subnet Selection.
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222-223
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224-254
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Private use.
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255
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End.
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