Debug and improve ARP-related functionality

[Manuel-Pol]

No description provided.

[MegaRedHand]

I get an error when selecting HTTP packets in the link layer:

Cannot read properties of undefined (reading 'octets')
TypeError: Cannot read properties of undefined (reading 'octets')
    at TcpSegment.computeChecksum (http://localhost:8080/bundle.js:17249:34)
    at get checksum (http://localhost:8080/bundle.js:17211:21)
    at TcpSegment.toBytes (http://localhost:8080/bundle.js:17266:46)
    at IPv4Packet.toBytes (http://localhost:8080/bundle.js:17061:36)
    at EthernetFrame.toBytes (http://localhost:8080/bundle.js:16658:36)
    at get crc (http://localhost:8080/bundle.js:16641:33)
    at EthernetFrame.getDetails (http://localhost:8080/bundle.js:16678:107)
    at Packet.getPacketDetails (http://localhost:8080/bundle.js:21859:31)
    at PacketInfo.addToggleInfo (http://localhost:8080/bundle.js:14968:43)
    at new PacketInfo (http://localhost:8080/bundle.js:14923:14)