This project started as a SNMP trap receiver & generator for a ARDUINO based network tester, and evolved from there.
We use the Arduino MEGA simply because of the additional memory capabilites, a single Ethernet Frame can be anything from 64 bytes to 1518 bytes 1522 bytes
if you include the VLAN tag or even more for Jumbo frames.
The UNO has 2K of SRAM for variable space, so you can see we soon run out of space, we can pretty much
fill that up with a single frame! Whilst the MEGA isn't exactly packed with memory, but there is 8 times as much Flash, 4 times as much
SRAM and 4 times as much EEPROM...not to mention the additional Digital, Analog and Serial ports.
These units we sell for around £8, so they don't really break the bank the bank, but they are pretty much essential for this project.
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