DELL N3000 User Manual

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Setting Basic Network Information
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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, you can reduce the MSS setting to a more appropriate 
value on the local host or alternatively, you can set system MTU to a smaller 
value.
Default Network Information
 
NOTE: 
N2000 switches do not have an out-of-band interface.
By default, no network information is configured. The DHCP client is 
enabled on the OOB interface by default on N3000 and N4000 switches.   
The DHCP client is enabled on VLAN 1 by default on the N2000 switches. 
DNS is enabled, but no DNS servers are configured. VLAN 1 does not have an 
IP address, subnet mask, or default gateway configured on N3000 and N4000 
switches.