Owner's Manual

Setting Basic Network Information 127
Adjusting the Management Interface MTU
When logging in to the PowerConnect 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.
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 by default. DNS is enabled, but no DNS
servers are configured.