[j-nsp] Does EX4200 support changing TCP-MSS on transit packets?

[Yucong Sun]

Would someone help to create one?

reducing TCP-MSS is really just a compare & write on a fixed location in IP
header, should be a simple enough operation., but without it half the world
doesn't work quite right with tunnels (GRE tunnels on ex)., due to
malfunctioning pmtu, so we kind of stuck with it.

J-series / SRX series support  system { internet-options { tcp-mss } } even
in packet mode, I would hope EX can do the same thing.


On Mon, Feb 24, 2014 at 4:37 AM, Mark Tinka <mark.tinka at seacom.mu> wrote:

> On Monday, February 24, 2014 02:18:35 PM Saku Ytti wrote:
>
> > I think you're mixing system level setting and interface
> > level setting. When configured in interface it indeed
> > mangles transit packets. When in system level it affects
> > local when interface it affects transit. IIRC JunOS does
> > not support interface-level 'stateless' mangling, but
> > will only do it in FW via flows.
>
> Yes, that's what I meant - a la Cisco's "ip tcp adjust-mss",
> which is, as you say, normally used fix-up weird MTU
> problems that are native to tunnels.
>
> I haven't heard of Junos having this on interfaces. But yes,
> agree Trio should be able to. Possibly worth someone
> submitting and ER for this.
>
> Mark.
>
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