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Subjectskb->data bytes
As a part of my research work, I've been working on introduction of
bit errors into packets. The main purpose is to choose a random byte
from (skb->head) to (skb->tail) (header & data) and change a bit in the
selected byte. And then, I test the throughput variation according to
the variation in ber using ttcp.

Here, I face a problem:
If a random byte within (skb->head) and (skb->data + 65) is chosen, the
throughput is acceptable. But, if a byte outside (skb->head) to
(skb->data + 65) is chosen, the transmission stops. The link becomes
congested and netstat shows a non-changing number of bytes in Send-Q
section. i.e., (skb->data + 66) to (skb->tail) are not allowed to be erred.
Is there any significance to the 65th byte and beyond in skb->data?


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