4000 Router Series Layer 3 - IP Services Command Reference

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tunnel dfbit enable

Use tunnel dfbit enable to set the Don't Fragment (DF) bit for tunneled packets.

Use undo tunnel dfbit enable to restore the default.

Syntax

tunnel dfbit enable

undo tunnel dfbit enable

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 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