howto/networksettings.md
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`rp_filter` also known as reverse path filtering is a security measure.
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When the route to return a packet uses a different interface than it arrived from, the packet is dropped.
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-Some attackers will set a wrong return address on their packets. This security measure was created to address when this happens. Core internet routing can however be asymmetric. This means, packets can take different routes on the return path.
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+Some attackers will set a wrong return address on their packets. This security measure was created to address when this happens. Core internet routing can however be asymmetric. This means that packets can take different routes on the return path.
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That is why `rp_filter` needs to be disabled.
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**Note** using sysctl is not persistent. Depending on your linux distribution put it into `/etc/sysctl.conf` or `/etc/sysctl.d`