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Cisco Bug: CSCsz07757 - ASA sends invalid DNS update request to external DHCP Server

Last Modified

Jan 09, 2017

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

8.0(3) 8.0(4)

Description (partial)

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.

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.
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