5-3
To improve security and avoid malicious attacks to the unused sockets, S5500-EI Ethernet switches
provide the following functions:
z
UDP ports 67 and 68 used by DHCP are enabled/disabled only when DHCP is enabled/disabled.
The implementation is as follows:
z
After the DHCP client is enabled by executing the
ip address dhcp-alloc
command, UDP port 68
is enabled.
z
After the DHCP client is disabled by executing the
undo
ip address dhcp-alloc
command, UDP
port 68 is disabled.
Examples
# Configure VLAN-interface 1 to obtain an IP address through DHCP.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] interface Vlan-interface 1
[Sysname-Vlan-interface1] ip address dhcp-alloc
BOOTP Client Configuration Commands
display bootp client
Syntax
display bootp client
[
interface
Vlan-interface
vlan-id
]
View
Any view
Parameters
vlan-id
: ID of the VLAN interface.
Description
Use the
display bootp client
command to display BOOTP client-related information, including the
MAC address of the BOOTP client and the IP address obtained.
Examples
# Display the BOOTP client-related information.
<Sysname> display bootp client interface Vlan-interface 1
Vlan-interface1:
Allocated IP: 192.168.0.2 255.255.255.0
Transaction ID = 0x3d8a7431
Mac Address 000f-e20a-c3ef
Default router: 192.168.0.1
Summary of Contents for 5500-EI PWR
Page 43: ...2 6...
Page 76: ...1 17...
Page 228: ...ii stp transmit limit 1 44 vlan mapping modulo 1 45 vlan vpn tunnel 1 46...
Page 477: ...5 24 Sysname vlan 2 Sysname vlan2 service type multicast...
Page 503: ...2 3 System View return to User View with Ctrl Z Sysname dot1x url http 192 168 19 23...
Page 519: ...iii...
Page 597: ...2 2 security policy server 192 168 0 1 user name format without domain...
Page 648: ...1 9 Examples Clear static ARP entries Sysname reset arp static...
Page 663: ...4 3 Sysname resilient arp interface vlan interface 2...
Page 767: ...1 28 From 12 00 Jan 1 2008 to 12 00 Jun 1 2008...
Page 1111: ...ii xmodem get 3 18...
Page 1314: ...A 44 Z...