Enabling Logging Of Ipsec Packets; Configuring The Df Bit Of Ipsec Packets - HP VSR1000 Security Configuration Manual

Enabling logging of IPsec packets

Perform this task to enable the logging of IPsec packets that are discarded because of reasons such as
IPsec SA lookup failure, AH-ESP authentication failure, and ESP encryption failure. The log information
includes the source and destination IP addresses, the SPI value, and the sequence number of a discarded
IPsec packet, and the reason for the failure.
To enable the logging of IPsec packets:
Step
1. Enter system view.
2. Enable the logging of IPsec
packets.

Configuring the DF bit of IPsec packets

Perform this task to configure the Don't Fragment (DF) bit in the new IP header of IPsec packets in one of
the following ways:
clear—Clears the DF bit in the new header.
•
• set—Sets the DF bit in the new header.
copy—Copies the DF bit in the original IP header to the new IP header.
•
You can configure the DF bit in system view and interface view. The interface-view DF bit setting takes
precedence over the system-view DF bit setting. If the interface-view DF bit setting is not configured, the
interface uses the system-view DF bit setting.
Follow these guidelines when you configure the DF bit:
• The DF bit setting takes effect only in tunnel mode, and it changes the DF bit in the new IP header
rather than the original IP header.
Configure the same DF bit setting on the interfaces where the same IPsec policy bound to a source
•
interface has been applied.
If the DF bit is set, the devices on the path cannot fragment the IPsec packets. Therefore, make sure
•
the path MTU is larger than the IPsec packets. Otherwise, the IPsec packets will be discarded. If the
path MTU is smaller than the IPsec packets, clear the DF bit.
To configure the DF bit of IPsec packets on an interface:
Step
1. Enter system view.
2. Enter interface view.
3. Configure the DF bit of
IPsec packets on the
interface.
To configure the DF bit of IPsec packets globally:
Command
system-view
ipsec logging packet enable
Command
system-view
interface interface-type
interface-number
ipsec df-bit { clear | copy | set }
190
Remarks
N/A
By default, the logging of IPsec
packets is disabled.
Remarks
N/A
N/A
By default, the interface uses the
global DF bit setting.