Re: [RAM] Tunnelling Route Reduction Protocol

[jnc at mercury.lcs.mit.edu (Noel Chiappa)]

    > From: Brian E Carpenter <brian.e.carpenter at gmail.com>

    >> 99.9% of the time, the originator of the packet has already had to do
    >> a DNS lookup or some other lookup to map a name to an IP address.

    > Wouldn't that be 49.95%? Half of all first packets tend to be responses
    > such as SYN/ACK that involve no DNS lookup. For a server handling
    > thousands of requests per second, adding a lookup means holding
    > thousands of TCBs in a wait state for the duration of the lookup.

True, but there's an obvious path to take in looking for delay improvments,
which is to 'piggyback' the reverse mapping information on the connection
opening.

(Appending control traffic to user data is a technique with a long history in
the data comm field, one that dates back to the ARPANet, where requests for
the allocation of packet reassembly buffers in destination IMPs were
piggybacked on the initial data fragment...)

    > There are perhaps some interesting DDOS attacks there.

Alas, even with piggybacking on data traffic, there are a host of security
issues. Sigh, TANSTAAFL...

	Noel

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