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At some point hitherto, Vriz hath spake thusly:
> Hi all,
> 
> IPv6's Routing Header plays the same role as the source routing option of
> IPv4, in which the source host specify a list of hops that the packet must
> traverse. However, could anyone advise on how the list of hops is chosen?
> Thank you.

In practice, it probably won't matter, since many routers' and hosts'
IP stacks now drop source routed packets for security reasons.  IIRC,
Source routing tells the recipient's replies to follow the path the
sender took to get to the recipient.  You can't specify the hops.  But
I may be mistaken.

The problem with this, of course, is that it greatly aids those who
are trying to spoof IPs.  This is why many IP stacks either drop
source routed packets by default or are recommended to be configured
to do so.

- -- 
Derek Martin               ddm@pizzashack.org    
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