Cisco Cisco Packet Data Gateway (PDG)
data-tunneling ignore df-bit
Controls the handling of the DF (Don't Fragment) bit present in the user IPv4/IPv6 packet for tunneling used
for the Mobile IP data path.
for the Mobile IP data path.
Product
GGSN
P-GW
SAEGW
Privilege
Security Administrator, Administrator
Command Modes
Exec > Global Configuration > Context Configuration > APN Configuration
configure > context context_name > apn apn_name
Entering the above command sequence results in the following prompt:
[
context_name
]
host_name
(config-apn)#
Syntax Description
[ default | no ] data-tunneling ignore df-bit
default
Restores the data-tunneling parameter to its default setting of disabled.
no
Disables this option. The DF bit in the tunneled IP packet header is not ignored during tunneling. This is the
default setting.
default setting.
ignore df-bit
Ignores the DF bit in the tunneled IP packet header during tunneling. This is the default setting.
Usage Guidelines
Use this command to configure a user so that during Mobile IP tunneling the DF bit is ignored and packets
are fragmented.
are fragmented.
If this feature is enabled, and fragmentation is required for the tunneled user IPv4/IPv6 packet, then the DF
bit is ignored and the packet is fragmented. Also the DF bit is not copied to the outer header.
bit is ignored and the packet is fragmented. Also the DF bit is not copied to the outer header.
In the GGSN, this command also affects the other L3 tunneling options, IP-in-IP and GRE, but does not affect
L2TP tunneling.
L2TP tunneling.
Command Line Interface Reference, Modes A - B, StarOS Release 19
1574
APN Configuration Mode Commands
data-tunneling ignore df-bit