R0106-HP MSR Router Series Layer 3 - IP Services Command Reference(V7)

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Usage guidelines
To avoid fragmentation and delay, set the DF bit for tunneled packets. Make sure 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. Then the command
discards packets that use a source or destination IPv4-compatible IPv6 address.
Examples
# Enable dropping of IPv6 packets using IPv4-compatible IPv6 addresses.
<Sysname> system-view
[Sysname] tunnel discard ipv4-compatible-packet
tunnel tos
Use tunnel tos to set the ToS of tunneled packets.
Use undo tunnel tos to restore the default.
Syntax
tunnel tos tos-value
undo tunnel tos