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Document ARP cache issue and workaround #376

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Aug 20, 2019
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Document ARP cache issue and workaround #376

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Expand Up @@ -151,6 +151,16 @@ if(!ether.dnsLookup("google.com"))
ether.printIp("Server: ", ether.hisip); // Result of DNS lookup is placed in the hisip member of EtherCard.
```

## Gotchas

Currently the library does not have a local network ARP cache implemented. This means if sending UDP:
* The only ARP lookup it does is for the gateway address.
* You cannot send UDP frames except via a gateway.

If you are wondering why your local UDP packets are not being received, this is why! (See [#59](https:/njh/EtherCard/issues/59), [#181](https:/njh/EtherCard/issues/181), [#269](https:/njh/EtherCard/issues/269), [#309](https:/njh/EtherCard/issues/309), [#351](https:/njh/EtherCard/issues/351), [#368](https:/njh/EtherCard/issues/368)).

The general workaround is to use a gateway and send UDP packets only to non-local network addresses.


## Related Work

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