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https://github.com/kernelkit/infix.git
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Joachim Wiberg
1bbd80d8c7
Let's drop the leading IETF or Infix prefixes from tests. Initially the idea was to mimnic the YANG models, but it's difficult to navigate and does not provide any real benefit to developers or end-users. Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
33 lines
1.0 KiB
Plaintext
33 lines
1.0 KiB
Plaintext
=== GRE Tunnel TTL verification
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ifdef::topdoc[:imagesdir: {topdoc}../../test/case/interfaces/tunnel_ttl]
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==== Description
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Verify that GRE and VXLAN tunnels use a fixed TTL (default 64) for
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encapsulated frames instead of inheriting the TTL from inner packets.
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Critical for protocols like OSPF that use TTL=1 for their packets.
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The test setup creates a tunnel between R1 and R3 so that injecting
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a frame with TTL=3 from PC:west, routing it through the tunnel, it
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would still reach PC:east. (Had it been routed via R2 it would be too
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many hops and the TTL would reach zero before the last routing step.)
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PC:west -- R1 -- R2 -- R3 -- PC:east
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`== Tunnel =='
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==== Topology
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image::topology.svg[GRE Tunnel TTL verification topology, align=center, scaledwidth=75%]
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==== Sequence
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. Set up topology and attach to target DUTs
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. Configure R1 with gre tunnel to R3
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. Configure R2 as intermediate router (underlay forwarding)
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. Configure R3 with gre tunnel to R1
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. Send ping from PC:west to PC:east with low TTL
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. Verify packets arrived at PC:east
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