Hi, sorry for posting this one more time but i'm still having difficulty figuring this out.
I have a GRE tunnel that im clearing the DF bit between two routers. No matter what i do its doesn't seem to be working when i test it.
I'm testing it by sending ICMP echo packets greater than 1500 with the DF bit set to 1, hoping that when the packet hits the physical outgoing interface it gets set to DF 0 and the packets will be fragmented over the tunnel but not matter what i do the icmp test never works.
when i ping from a PC connected to a vlan on this router using ping x.x.x.x -l 1510 -f get the packet needs to be fragmented but DF set and it never works. I'm kind of lost as to why this isn't working as it should be a straightforward config.
nevermind i found the issue, after using wireshark it was clear that i was testing wrong. On my pc the ethernet has an mtu of 1500 and i was ping with 1510 with the DF bit set, to it was not even leaving the local ethernet. After i lowered the mtu (a value higher than the tunnel MTU but lower than the 1500 local ethernet MTU) and set the DF bit to 1 , the FD was set to zero and it worked.
“Use Serviceability Features to Troubleshoot your Cat9K as a Cisco TAC Engineer”
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