Handling packets with 802.1Q VLAN tag

[Nida Afreen]

I am using sendPacket with checkMtu as false to send packets of size 1518 bytes having the following fields;

Ethernet header - 14 bytes

802.1Q VLAN tag - 4 bytes

IP header - 20  bytes

UDP header - 8 bytes

Data - 1472 bytes

The sendPacket failes with error "send error:

packetSendPacket failed".

But the same works when packet size is 1514 bytes (with 4 bytes VLAN tag).

Can you please explain how to handle packets having VLAN tag and are greater than 1514 bytes MTU. Is fragmentation required? If yes, then what should be the IPv4 length; 1500 or 1496?

Regards,

Nida

[PcapPlusPlus Support]

Hi Nida,

I'm sorry for the late reply. Maybe the NIC doesn't allow sending packets with more than 1514 bytes?

Thanks,

PcapPlusPlus maintainer

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