R21xx-HP FlexFabric 11900 Layer 3 IP Services Command Reference

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Default
The DF bit is not set for tunneled packets.
Views
Tunnel interface view
Predefined user roles
network-admin
Usage guidelines
To avoid fragmentation and delay, set the DF bit for tunneled packets. Make sure that the path MTU is
larger than tunneled packets. Otherwise, do not set the DF bit to avoid discarding tunneled packets
larger than the path MTU.
This command is not supported on a GRE over IPv6 tunnel interface and an IPv6 tunnel interface.
Examples
# Set the DF bit for tunneled packets on the interface Tunnel 1.
<Sysname> system-view
[Sysname] interface tunnel 1 mode gre
[Sysname-Tunnel1] tunnel dfbit enable
tunnel discard ipv4-compatible-packet
Use tunnel discard ipv4-compatible-packet to enable dropping of IPv6 packets using IPv4-compatible
IPv6 addresses.
Use undo tunnel discard ipv4-compatible-packet to restore the default.
Syntax
tunnel discard ipv4-compatible-packet
undo tunnel discard ipv4-compatible-packet
Default
IPv6 packets using IPv4-compatible IPv6 addresses are not dropped.
Views
System view
Predefined user roles
network-admin
Usage guidelines
The tunnel discard ipv4-compatible-packet command enables the device to check the source and
destination IPv6 addresses of the de-encapsulated IPv6 packets from the tunnel and discard packets that
use a source or destination IPv4-compatible IPv6 address.