Bob Van Zant wrote:
I'm experimenting with netgraph to try to implement an IPv6 -> IPv4 gateway,
as specified here:
http://tools.ietf.org/html/draft-xli-behave-ivi-02
hi bob,
I can give you a hand if you want..
I'm busy tomorrow Morning but I can give you a call tomorrow afternoon
if you like..
also, Joe in India has been using netgraph..
This is my first time ever working with netgraph and I admit to being a bit
lost. I have a netgraph node that gets wired up with an ng_ether node. My
lower hook gets wired to the ng_ether lower hook and my upper to his upper.
It's receiving IPv6 + UDP packets, creating IPv4 + UDP packets and then
writing the new packets out with NG_FWD_NEW_DATA.
I'm perfectly willing to waste time making stupid mistakes on this project,
however, right now I'm stuck. I can't "find" the translated packets I'm
writing anywhere to see what, if anything, is wrong with them. They don't
show up in tcpdump on the local machine (I've tried writing to both the
upper and lower hook). They don't show up in tcpdump on other machines on
the network.
I tried attaching nghook to the "orphans" hook of the ng_ether node but it
doesn't appear to be seeing any data.
add a tee node between your node and the ether hook to see what you
are sending.
netstat -s -p udp doesn't show any packets when my node is enabled (I think
this means my node is effectively swallowing them).
probably
I've tried to figure out how to wire in an ng_tee node but I'm a little lost
as to how to do this (I still haven't figured out the ngctl syntax).
ahh
#add a tee to the ethernet lower hook
ngctl mkpeer em3: tee lower left
ngctl name em3:lower lowertee
#then add your node to the right hook of the tee.
ngctl mkpeer lowertee: mytype right lower
ngctl name lowertee:right mynode
#similar for the upper hook except that you use connect instead of
#mkpeer for the last step as your node already exists.
ngctl mkpeer em3: tee upper left
mgctl name em3:upper uppertee
ngctl connect uppertee: mynode: upper upper
-------
now you can examine traffic on the two tee nodes let2right hook and
rigt2left hook
Any tips for figuring out what I'm doing wrong? Debug options to enable that
will show me more information about what's happening after I call
NG_FWD_NEW_DATA? If I got ng_tee wired in would it's tap hooks show me what
I want? A better way to try to tee the data?
Thanks,
Bob
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