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Date:   Mon, 13 Mar 2017 13:28:59 -0700
From:   Roopa Prabhu <>
To:     Robert Shearman <>
        "Eric W. Biederman" <>,
        David Ahern <>
Subject: Re: [PATCH net-next v3 0/2] mpls: allow TTL propagation to/from IP
 packets to be configured

On 3/10/17, 12:43 PM, Robert Shearman wrote:
> It is sometimes desirable to present an MPLS transport network as a
> single hop to traffic transiting it because it prevents confusion when
> diagnosing failures. An example of where confusion can be generated is
> when addresses used in the provider network overlap with addresses in
> the overlay network and the addresses get exposed through ICMP errors
> generated as packets transit the provider network.
> In addition, RFC 3443 defines two methods of deriving TTL for an
> outgoing packet: Uniform Model where the TTL is propagated to/from the
> MPLS header and both Pipe Models and Short Pipe Models (with and
> without PHP) where the TTL is not propagated to/from the MPLS header.
> Changes in v3:
>  - decrement ttl on popping last label when not doing ttl propagation,
>    as suggested by David Ahern.
>  - add comment to describe what the somewhat complex conditionals are
>    doing to work out what ttl to use in mpls_iptunnel.c.
>  - rearrange fields fields in struct netns_mpls to keep the platform
>    label fields together, as suggested by David Ahern.
> Changes in v2:
>  - add references to RFC 3443 as suggested by David Ahern
>  - fix setting of skb->protocol as noticed by David Ahern
>  - implement per-route/per-LWT configurability as suggested by Eric
>    Biederman
>  - split into two patches for ease of review
> Robert Shearman (2):
>   mpls: allow TTL propagation to IP packets to be configured
>   mpls: allow TTL propagation from IP packets to be configured
Acked-by: Roopa Prabhu <>

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