Cisco Cisco IPS 4255 Sensor 릴리즈 노트

If you are using signature updates 500 to 553 or 555 to 559, you need to disable signature 23899.0 before 
applying the 7.1(2)E4 update. Signature update S550 introduced a bad value for one of the parameters 
of signature 23899.0 in addition to retiring and disabling it. This bad parameter was included in signature 
updates S500to S553 and S555 to S559.

Because this signature was retired and disabled, the bad parameter does not affect the functionality of 
the sensor. Updating to this service pack or S567 or later resolves the problem. Signature 23899.0 has 
been retired, disabled, and obsoleted. 

For the procedure for disabling signatures, for the IDM refer to 

. 

Refer to the following URL for information about ASA module jumbo packet frame size:

9

A jumbo frame is an Ethernet packet that is larger than the standard maximum of 1518 bytes (including 
Layer 2 header and FCS).

The jumbo packet count in the show interface command output from the lines 

Total Jumbo Packets 

Received

 and 

Total Jumbo Packets Transmitted

 for ASA IPS modules may be larger than expected 

due to some packets that were almost jumbo size on the wire being counted as jumbo size by the IPS. 
This miscount is a result of header bytes added to the packet by the ASA before the packet is transmitted 
to the IPS. For IPv4, 58 bytes of header data are added. For IPv6, 78 bytes of header data are added. The 
ASA removes the added IPS header before the packet leaves the ASA.

You can find major and minor updates, service packs, signature and signature engine updates, system 
and recovery files, firmware upgrades, and Readmes on the Download Software site on Cisco.com. 
Signature updates are posted to Cisco.com approximately every week, more often if needed. Service 
packs are posted to Cisco.com in a release train format, a new release every three months. Major and 
minor updates are also posted periodically. Check Cisco.com regularly for the latest IPS software.

You must have an account with cryptographic access before you can download software. You set this 
account up the first time you download IPS software from the Download Software site.