Administrator Guide

Setting Basic Network Information 169
The administrator can assign an IPv4 address or IPv6 addresses to the OOB
management port and to any VLAN. By default, all ports (other than the OOB
port) are members of VLAN 1. If an IP address is assigned to VLAN 1, it is
possible to connect to the switch management interface by using any of the
front-panel switch ports. This is required to manage the
Dell Networking
N1500 and N2000 Series
switches. The use of VLAN 1 for switch
administration presents some security risks. Alternatively, a management
VLAN can be assigned as the native VLAN for a limited set of front-panel
ports and an IP address can be assigned to that VLAN. The use of ACLs to
restrict access to switch management is strongly recommended.
DHCP can be enabled on the OOB interface and VLAN interfaces
simultaneously, or they can be configured with static information. To
configure static address information on the default VLAN (or the
management VLAN), set the IP address and subnet mask on the VLAN
interface and configure a global default gateway for the switch. If a default
gateway is configured on routing interfaces (front-panel ports), then IP
addresses not in the OOB port subnet will not be reachable via the OOB port.
Adjusting the Management Interface MTU
When logging in to the Dell Networking N-Series switch using TCP, the
switch negotiates the TCP Maximum Segment Size (MSS) using the
minimum of the requested MSS or the MTU setting of the port. TCP packets
are transmitted from the switch with the DF (Don't Fragment) bit set in
order to receive notification of fragmentation from any transit routers. Upon
receiving an ICMP
Destination Unreachable, Fragmentation needed but DF
set
notification, the switch will reduce the MSS. However, many firewalls
block ICMP Destination Unreachable messages, which causes the destination
to request the packet again until the connection times out.
To resolve this issue, reduce the TCP MSS setting to a more appropriate value
on the local host or alternatively, set the system MTU to a smaller value.
Default Network Information
NOTE: Dell Networking N1500 and N2000 Series switches do not have an out-of-
band interface.