Dell POWEREDGE M1000E - Manual (Page 119)

Setting Basic Network Information 119
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.
In order to resolve this issue, you can reduce the MSS setting to a more
appropriate value on the local host or alternatively, you can set the MTU on
the PowerConnect management port to a smaller value.
Default Network Information
By default, no network information is configured. The DHCP client is
enabled on the OOB interface and disabled on the management VLAN. DNS
is enabled, but no DNS servers are configured.