1-4
To improve security and avoid malicious attacks to the unused sockets, S5500-EI Ethernet switches
provide the following functions:
UDP ports 67 and 68 used by DHCP are enabled/disabled only when DHCP is enabled/disabled.
The implementation is as follows:
z
After DHCP is enabled by executing the
dhcp enable
command, if the DHCP server and DHCP
relay functions are not configured, UDP port 67 and UDP port 68 ports is kept disabled; if the
DHCP server and DHCP relay functions are configured, UDP 67 and UDP 68 ports are enabled.
z
After DHCP is disabled by executing the
undo
dhcp enable
command, even if the DHCP server
and DHCP relay functions are configured, UDP port 67 and UDP port 68 ports is disabled.
Examples
# Enter system view.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
# Enable DHCP.
[Sysname] dhcp enable
dhcp select global
Syntax
VLAN interface view:
dhcp select global
undo dhcp select
System view:
dhcp select
global
{
interface
interface-type interface-number [
to
interface-type interface-number ] |
all
}
undo dhcp select
{
interface
interface-type interface-number [
to
interface-type interface-number ] |
all
}
View
System view, VLAN interface view
Parameters
interface interface-type interface-number
[
to interface-type interface-number
]: Specifies the
interface(s) to operate in global address pool mode. The
interface-type
argument specifies an interface
type; the
interface-number
argument specifies an interface number; the
interface interface-type
interface-number
[
to interface-type interface-number
] keyword and argument combination specifies
an interface range.
all
: Specifies all interfaces to operate in global address pool mode.
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...