I need to enable sequence numbers on a GRE interface. Right now when I show interface Tun0 I see this:
Tunnel protocol/transport GRE/IP
Key disabled, sequencing disabled
Checksumming of packets disabled
According to every online documentation I can find, I should be able to go to the tunnel config and type the following:
router(config-if)# tunnel sequence-datagrams
However, when I look for this option, I don't see it. I see the option for checksum and key, but not sequence. How do I enable the S-bit in GRE? Is there something I need to enable/disable in order to get this option to show up?
This is what my tun interface looks like:
interface Tunnel0
ip address 192.168.13.1 255.255.255.0
tunnel source 192.168.12.1
tunnel destination 192.168.12.3
tunnel key 1
tunnel checksum
Thanks,
-Justin
