Specifications

32
Release Notes for Cisco uBR924 Cable Access Router for Cisco IOS Release 12.1(5)T
OL-0385-04 Rev. B0 (2/2001)
Caveats
This caveat was closed without modification because GRE tunnels are not currently supported on
any software image for the Cisco uBR924 Cable Access Routers. IPSec tunnels, however, are
supported when using Cisco IOS images that support IPSec encryption.
• CSCdr11723
This caveat described a situation in which two Cisco uBR924 Cable Access Routers could no
longer establish voice calls. The routers needed to be reloaded before being able to make additional
voice calls.
This caveat is resolved in Cisco IOS Release 12.1(2)T.
• CSCdr32984
To comply with DOCSIS regulations that restrict access to commands that change DOCSIS
parameters, the following commands have been removed from the CLI:
– [no] cable-modem downstream saved channel
– [no] cable-modem fast-search
– [no] cable-modem downstream symbol rate
– [no] cable-modem transmit-power
– [no] cable-modem upstream preamble qpsk
In Cisco IOS Release 12.1(2)T, these commands are now reserved exclusively for DOCSIS use.
• CSCdr36952
A defect could cause a Cisco router to crash and hang when the Cisco web server was enabled with
the ip http server command and a browser connects to http://<router-ip>/%%. The defect could
be exploited to produce a denial of service (DoS) attack. This fact was announced on public Internet
mailing lists, which are widely read both by security professionals and by security “crackers”, and
should be considered public information.
The workaround to this defect was to disable the Cisco web server with the command:
no ip http server
Alternatively, the administrator could choose to block port 80 connections to the router via access
lists or other firewall methods. For further information, a Security Advisory will be posted to
http://www.cisco.com/warp/public/707/advisory.html.
This caveat is resolved in Cisco IOS Release 12.1(2)T.
Note Although CSCdr36952 has been resolved in Release 12.1(2)T, Cisco
recommends that the Cisco web server be disabled on any Cisco uBR900
series router installed in a subscriber environment using the no ip http server
command.
• CSCdr40540
The Cisco uBR924 Cable Access Router reverses the order in which it should obtain the IP address
of its default gateway from the information that the DHCP server supplies during power-on
provisioning. If both the router and giaddr fields are present, the Cisco uBR924 Cable Access
Router should use the value from the router field as the address for the default gateway, but instead
it uses the value from the giaddr field.
This caveat is resolved in Cisco IOS Release 12.1(2)T so that the Cisco uBR924 Cable Access
Router uses the router field, if present, as its default gateway. If the DHCP server does not provide
the router field, the Cisco uBR924 Cable Access Router then uses the giaddr field.