Thanks to the last poster for the suggestion. I changed it so that bridge0 has
an IP of 10.1.1.4 and took the other two IPs away and unfortunately it did not
alter my problem. However, I did notice something while doing it. If I do an
ipfw flush (leaving only one rule allow ip from any to any) then I can ping ok from
10.1.1.1 to 10.1.1.5. However, if I attempt to add a dummynet style pipe by
doing say "ipfw add 500 pipe 1 ip from any to any" then I can no longer ping from 10.1.1.1
from 10.1.1.5. That seems to imply to me that I'm doing something wrong in my ipfw config but I don't know what. I'm using the dummynet instructions that the second poster suggested.
Thanks for any help.