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Example: pmtud in

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r1

hostname r1
vrf def v1
 rd 1:1
 exit
int ser1
 vrf for v1
 ipv4 addr 1.1.1.1 255.255.255.0
 ipv6 addr 1234::1 ffff::
 ipv4 pmtud-in 1400
 ipv6 pmtud-in 1400
 exit

r2

hostname r2
vrf def v1
 rd 1:1
 exit
int ser1
 vrf for v1
 ipv4 addr 1.1.1.2 255.255.255.0
 ipv6 addr 1234::2 ffff::
 ipv4 pmtud-in 1400
 ipv6 pmtud-in 1400
 exit

r1 tping 100 15 1.1.1.2 vrf v1 siz 1400
r2 tping 100 15 1.1.1.1 vrf v1 siz 1400
r1 tping 100 15 1234::2 vrf v1 siz 1400
r2 tping 100 15 1234::1 vrf v1 siz 1400
r1 tping -100 15 1.1.1.2 vrf v1 siz 1401 error
r2 tping -100 15 1.1.1.1 vrf v1 siz 1401 error
r1 tping -100 15 1234::2 vrf v1 siz 1401 error
r2 tping -100 15 1234::1 vrf v1 siz 1401 error
  1. Install ContainerLab as described here
  2. Fetch conn-frag04 file
  3. Launch ContainerLab conn-frag04.yml topology: 

   containerlab deploy --topo conn-frag04.yml
4. Destroy ContainerLab conn-frag04.yml topology: 

   containerlab destroy --topo conn-frag04.yml
5. Copy-paste configuration for each node in the lab topology

  1. Fetch or compile freeRtr rtr.jar file.
    You can grab it here
  2. Fetch conn-frag04.tst file here
  3. Launch conn-frag04.tst test: 

   java -jar ../../rtr.jar test tester conn-frag04 path ./ temp ./ wait
4. Destroy freeRtr conn-frag04.tst test: 

   Ctrl-C (In freeRtr test window)