Juniper EX3400 Features Manual
Download Features manual of Juniper EX2300 Network Router, Switch for Free or View it Online on All-Guides.com.
Brand: Juniper
Category: Network Router , Switch
Type: Features manual
Model: Juniper EX2300 , Juniper EX4300 , Juniper EX3400
Pages: 476
Table 9: Unsupported Opaque DHCP Options
CommentsOption NameDHCP Option
Not supported.Pad OptionOption 0
Value is provided by RADIUS
attribute 27 (Session-Timeout).
IP Address Lease TimeOption 51
Not supported.Option OverloadOption 52
Value is provided by DHCP local
server.
DHCP Message TypeOption 53
Value is provided by DHCP local
server.
Server IdentifierOption 54
Value is provided by DHCP local
server.
Parameter Request ListOption 55
Value is provided by DHCP local
server.
EndOption 255
Not supported.DHCP magic cookie–
Related
Documentation
Monitoring DHCP Options Configured on RADIUS Servers•
Port Number Requirements for DHCP Firewall Filters
When you configure a firewall filter to perform some action on DHCP packets at the
Routing Engine, such as protecting the Routing Engine by allowing only proper DHCP
packets, you must specify both port 67 (bootps) and port 68 (bootpc) for both the source
and destination. The firewall filter acts at both the line cards and the Routing Engine.
This requirement applies to both DHCP local server and DHCP relay, but it applies only
when DHCP is provided by the jdhcpd process. MX Series routers use jdhcpd. For DHCP
relay, that means the configuration is required only at the [edit forwarding-options
dhcp-relay] hierarchy level and not at the [edit forwarding-options helpers bootp] hierarchy
level.
DHCP packets received on the line cards are encapsulated by jdhcpd with a new UDP
header where their source and destination addresses are set to port 68 before being
forwarded to the Routing Engine.
For DHCP relay and DHCP proxy, packets sent to the DHCP server from the router have
both the source and destination UDP ports set to 67. The DHCP server responds using
the same ports. However, when the line card receives these DHCP response packets, it
changes both port numbers from 67 to 68 before passing the packets to the Routing
Engine. Consequently the filter needs to accept port 67 for packets relayed from the
client to the server, and port 68 for packets relayed from the server to the client.
Copyright © 2017, Juniper Networks, Inc.36
DHCP and Other System Services Feature Guide for EX2300, EX3400, and EX4300 Switches