Re: weird ip sequence number

[Alan Cox]

> Although there are few chances that our randomly chosen ip_id collides
> with the other packet's ip_id generated by kernel, I don't want this
> possibility to happen.

So pick one at random. However its a pretty strange way to abuse IP.

> So is there any method to get a true ip_id from the kernel? 
> I want this ip_id to do my own fragmentation on a packet.

Linux does not generate ip idents on DF frames. You can't fragment a DF
frame anyway so the problem does not arrive. Frames without DF get assigned
ip ids