Incorrect host name length ASA DHCP Request

Hi Mark,

That's exactly the problem described in, here's a copy of the bug release notes:

Symptom:

When VPN Clients connect to the ASA the ASA inserts an extra character or carriage return in the DHCP scope which causes the users' application to display dhcp information on two lines as opposed to one; the extra character causes a line feed on address resolution and automated tools can't handle the result.
This is also noticed as an extra symbol that looks like a box/carriage return added to the "Name" Field within the Windows 2003 Server > DHCP > Scope > Address Leases.
Conditions:
ASA using Windows 2003 Server as external DHCP Server.

VPN Clients update DNS using DHCP protocol through ASA to external Windows 2003 DHCP server.

ASA has "dhcp-client update dns" or "dhcp-client update dns server none" configured.
Workaround:
Don't update DNS through DHCP to an external server, i.e. configure "no dhcp-client update dns".
Further Problem Description:
The ASA sends the DHCP server a packet with malformed DHCP option 81 (Client Fully Qualified Domain Name) which causes the Windows 2003 Server to add a character to the 'Name' field in the DHCP Scope Address Leases seen on the Server.  This character looks to be a carriage return.




You have 'dhcp-client update dns' configured on your ASA?
If so, could you delete and see if the ASA always sends option 81?
Kind regards
Nicolas
 
         
 
         
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 Tags: Cisco Security
 
         
         
 
          
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