OSPF doesn't generate broadcast packets. It genereates multicast packets; the ones addressed to 224.0.0.5 are received by all OSPF routers, and the ones addressed to 224.0.0.6 are received by all DRs. I suppose you should allow transport protocol number 89 - if you only allow TCP (6) and UDP (17), OSPF information just won't get through. That's my $0.02. Take my advice with a grain of salt, however, because I've only recently started to prepare for my Routing exam.
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