Re: [IPsec] Labeled IPsec options

[Paul Wouters <[e-mail]>]

On Fri, 13 Dec 2019, Valery Smyslov wrote:

>> I don't think that matters. Security labels are never optional but always
>> mandatory. And it seems very unlikely to have a mix of child sa's with and
>> without label. So they will all have a label, and then failing the  IKE SA
>> is fine,
>
> Do you want to say, that it's impossible to have two SGWs with multiple
> networks behind them so, that traffic from some networks will have security
> labels and traffic from the others won't have?

I'm not saying it is impossible. I am saying it is not likely to be a
real life configuration. If you classify network traffic with labels,
your goal is to not have unlabeled traffic come in at all. You might
have a label SEC_WHATEVER, but it still seems far more likely you would
mark the traffic as having come from SGWx with some kind of LABELx to
track the origin throughout your network.

> If such a configuration is possible, then it's perfectly OK to have a mix
> of labelled and non-labelled IPsec SAs created by one IKE SA.

I'd argue the reverse. It would likely be better not to allow such an
awful configuration :)

Paul