reject humanity, become toaster | she/they | experimenting with names

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Cake day: June 11th, 2023

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  • Disclaimer: I am not a professional network engineer, this is just what i found out after researching some iptables terminology.

    the lan => wan is perhaps a bit misleading. lan is the zone, or which side of the router this firewall rule is in reference to. wan is another zone, the arrow shows where packets of type Forward are ending up.

    • Input means packets originating from another device within this zone with the router as the destination.
    • Output is a packet from the router to another device in the zone.
    • Forward is a packet originating from one zone with a destination in another zone.

    When forward on the wan interface is set to reject, it essentially means no device from outside may initiate a connection. However, they may respond to already opened connection.

    I don’t yet know what masquerade does.





  • fun situations can arise when you write , instead of ; For those not in the know, in c++ the comma operator evaluates the left expression, discards the value, then evaluates the right expression and returns the value. if you now have a a situation like this

    int i = 0,
    printf("some message");
    

    i has a completely different value, since it actually uses the return value of printf instead