Enterasys csx150 Guia Do Utilizador
USER’S GUIDE
398 CyberSWITCH
Problem:
The DHCP Proxy Client is enabled, and it has opened its UDP port, but there aren’t any “DHCP-
obtained” addresses in the IP Address Pool.
The DHCP Proxy Client is enabled, and it has opened its UDP port, but there aren’t any “DHCP-
obtained” addresses in the IP Address Pool.
Action:
1.
1.
Check the DHCP-related configuration for WAN and WAN (Direct Host) IP network interfaces
which should have IP addresses obtained from DHCP servers for them. Use CFGEDIT, or use
the
which should have IP addresses obtained from DHCP servers for them. Use CFGEDIT, or use
the
ipnetif
command from Manage Mode. Correct if necessary.
2.
Make sure that the LAN port to reach the DHCP server on for the interface is correct.
3.
If the DHCP server is on a directly-connected LAN, you should be able to
ping
it successfully
from the CyberSWITCH. If you cannot, check the LAN port IP configuration; make sure the
DHCP server is operational.
DHCP server is operational.
4.
If the DHCP server is not on the directly-connected LAN, a DHCP Relay Agent must be. A
relay agent is required in order to successfully forward DHCP packets to a DHCP server on a
different sub-network.
relay agent is required in order to successfully forward DHCP packets to a DHCP server on a
different sub-network.
5.
Assuming that a DHCP Relay Agent is present on the directly-connected LAN, you can attempt
to
to
ping
the DHCP server. This may require the addition of IP static routes on both the
CyberSWITCH and the DHCP server. These static routes are required for smooth operation of
the DHCP protocol.
the DHCP protocol.
6.
If the DHCP server is not on a directly-connected LAN, another test may be performed. If at all
feasible, place a DHCP client workstation on the same LAN with the server. See if this DHCP
client can obtain an IP address from the DHCP server.
feasible, place a DHCP client workstation on the same LAN with the server. See if this DHCP
client can obtain an IP address from the DHCP server.
P
ROXY
ARP O
PERATION
Problem:
Two IP hosts devices on different subnets in an IP network are unable to communicate across the
WAN.
Two IP hosts devices on different subnets in an IP network are unable to communicate across the
WAN.
Action:
1.
1.
On both CyberSWITCH platforms, issue the
ipnetif
manage mode command to make sure
that the proxy ARP feature is enabled for the LAN interface. If it is not enabled on one or both
of the CyberSWITCH platforms, enable it through the CFGEDIT configuration utility. Note
that you have to restart the system for the changes to be effective.
of the CyberSWITCH platforms, enable it through the CFGEDIT configuration utility. Note
that you have to restart the system for the changes to be effective.
2.
On both platforms, issue the
ipnetif
manage mode command to make sure the LAN
interfaces are configured with the proper subnet mask. Configure these platforms with the
proper subnet masks, not the natural masks.
proper subnet masks, not the natural masks.
3.
On both platforms, issue the
iproute
manage mode command to make sure that each system
knows about the IP subnet at the other Ethernet segment.
4.
If the two IP host devices still can not communicate with each other, contact your Distributor
or Customer Support.
or Customer Support.