Specifications

149
Caveats for Cisco IOS Release 12.0
78-6455-12
Resolved Caveats—Cisco IOS Release 12.0(2)
• CSCdk34205
If you are using NFAS with a backup D-channel and the primary D-channel goes down, modem
calls might fail to be accepted into the access-server. Enabling the debug modem csm command
displays the “dchan_idb state is not up” error message.
• CSCdk34893
A router fails right after the user configures an S/T BRI interface into the 128-kbps leased-line
mode. There is no workaround.
• CSCdk34968
After 32767 encryption connection setup attempts, encryption connection setups might not
complete.
Workaround: Reload the router.
• CSCdk35745
CBAC fails to create the dynamic ACLs to allow the establishment of FTP data channels if the FTP
client sends command terminated with a single carriage return character (instead of carriage return
and linefeed characters). The symptom of this problem is that the FTP client hangs after issuing
commands that require the exchange of port (to set up a data channel between client and server)
like ls, get and put.
• CSCdk38133
The cablelength configuration command for the CT1 module is missing in the Cisco 2600 series
router for Release 11.3 T.
• CSCdk38459
On a Cisco 2600 series router issuing the commands shutdown followed by no shutdown,orclear
interface bri, to a BRI interface on the MBRI-NM does not bring up the ISDN D-channel layer 2.
The ISDN layer 2 shows that it attempts to send the line setup frame, but reports that the other end
does not respond correctly. This is because the interface hangs and there are no more frames
transmitted.
Workaround: Do not issue these commands. If the interface needs to be reset, the router needs to
be reloaded.
• CSCdk39728
If an interface is configured for both NAT outside and encryption, all incoming packets targeted at
the router are forced to the encryption engine, regardless of whether or not they are (or should be)
encrypted. All non-encrypted packets are then dropped by the encryption engine.
• CSCdk39922
When attempting to dial out on a Cisco 3600 series router using the digital modems and a single
port T1 network module, the outbound call fails with “No Answer”. Inbound calls function
correctly. Outbound dialing with T1 CAS and a dual-port T1 network module works correctly.
• CSCdk40114
If the TCP keepalive timer is configured, the router might fail in random places in the TCP stack
due to corruption of the TCP control block.