Hi Raul, On Fri, Sep 01, 2017 at 04:39:35PM +0000, Raul Martinez wrote: > Hi Pablo, > > Ultimately my use would be to read the first byte of a ESP IP > packet's data payload. So IP layer is where I would want the > expression to work in. > > The packets I am working with are identical and need to be > routed to one of two interfaces based on if the first byte of > the data contents is non-zero. OK, so it's just an arbitrary byte. Not anything in a standard header that needs to be matched. I'm asking because we could add the protocol definition for what you need, so we don't need to use raw expressions. -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html