Fabric OS Administrator’s Guide 129
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Listener applications
6
Unblocking Telnet
1. Connect to the switch through a serial port or SSH and log in as admin.
2. Type in the ipfilter
--delete command.
Refer to “Deleting a rule to an IP Filter policy” on page 159 for more information on deleting IP
filter rules.
3. To permanently delete the policy, type the ipfilter
--save command.
If you deleted the rule to permit Telnet, you will need to add a rule to permit Telnet.
Listener applications
Brocade switches block Linux subsystem listener applications that are not used to implement
supported features and capabilities. Table 22 lists the listener applications that Brocade switches
either block or do not start.
Ports and applications used by switches
If you are using the FC-FC Routing Service, be aware that the secModeEnable command is not
supported.
Table 23 on page 130 lists the defaults for accessing hosts, devices, switches, and zones.
TABLE 22 Blocked listener applications
Listener application Brocade DCX and DCX 8510 Backbone families Brocade switches
chargen Disabled Disabled
echo Disabled Disabled
daytime Disabled Disabled
discard Disabled Disabled
ftp Disabled Disabled
rexec Block with packet filter Disabled
rsh Block with packet filter Disabled
rlogin Block with packet filter Disabled
time Block with packet filter Disabled
rstats Disabled Disabled
rusers Disabled Disabled
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