why is IPTOS_MINCOST ignored?

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(please cc me on any reply, thanks)

i'm looking at linux-2.4.20-rc4-ac1 code (and various other 2.4.x) and i
see this:

./include/net/route.h:#define IPTOS_RT_MASK     (IPTOS_TOS_MASK & ~3)

which causes the IPTOS_MINCOST bit (2) to be ignored even if setsockopt is
used to specify it.

why is this?  is it a bug?

the other 3 tos bits appear to work fine.

thanks
-dean
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