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Having information in the packet that tells the receiving station if the packet has been received correctly is much like a read receipt and tells the sender it was received correctly.
So many hams are on packet now that someone in the local radio club will probably be able to help you if you have problems, or ask around on the local repeater or a simplex frequency.
Although you are operating your packet station on simplex, it is best not to use the designated FM simplex frequencies because packet and voice are not compatible modes.
Transport mode secures portions of the existing IP header and the payload data of the packet, and inserts an IPsec header between the IP header and the payload; tunnel mode adds an additional IP header before performing similar operations.
Next, the packet is decrypted or authenticated based on its IPsec header and the SA, followed by a verification step that checks the contents of the original packet and its payload (especially the inner IP header and transport headers) against the respective SA.
Transport mode SAs are prohibited, because they would not result in IP encapsulation (the encapsulation header is part of the tunnel mode SA, a transport mode SA would not cause encapsulation), and thus lead to processing loops.
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