On Tue, May 29, 2018 at 7:56 PM, Maria Jan Matějka <[email protected]> wrote: > On May 29, 2018 8:42:22 PM GMT+02:00, Job Snijders <[email protected]> wrote: >>On https://gitlab.labs.nic.cz/labs/bird/wikis/BGP_filtering I see the >>following curious snippet: >> >> function xx() >> { >> ... >> if bgp_next_hop != from then return false; >> ... >> } >> >>What in the above example does "from" mean? Is "from" some kind of >>magic >>keyword that expands into something? > > Yes. It expands to the author of the route (IP of its sender). Therefore this > check is to filter out routes with other next hop than the sender herself as > this is probably some scam or misconfiguration.
Thank you for the quick answer! Very useful Kind regards, Job
