Hello all, I need to forward udp broadcasts for a particular project. I know it's not a good thing security-wise, but that's a different discussion! Essentially, on network 10.0.2.0/24 there is a special program that generates udp broadcast packets for network 192.168.2.0/24 (this program then, is sending packets with a destination address 192.168.2.255). My Linux 2.4.22 based firewall/router does its job well and normally drops these broadcast packets. I have since found a couple (partial) solutions, but I'm curious as to what the Linux 2.4 kernel can do. >From the research I've done, it seems that directed broadcasts (that is, addresses with the form 192.168.2.255) are not supposed to be routed. An RFC even proposes that routers include the directed broadcast routing option, but that this routing option should be turned off by default: http://www.faqs.org/rfcs/rfc2644.html Here's my question: Is there anything in the Linux 2.4 kernel that allows forwarding directed broadcasts? That is, is there an option that can be enabled in the Linux 2.4 kernel to allow forwarding directed broadcasts? >From the tests I've done using DNAT, I can route these packets, but as unicast packets only (not as broadcast packets). This means that only *one* machine on the destination network receives these packets (the goal is for *all* the machines to receive the udp packets). I've also found that using a udp proxy type program allows me to forward these packets. There is, of course, the option of implementing a bridge, but we want to avoid bridging the two networks. For this particular project, we'd like to find a kernel based solution (if at all possible). Any ideas? :-) Thank you in advance for any information, Ann Arona Ann Pearlstein aronapearl@xxxxxxxxx __________________________________ Do you Yahoo!? Protect your identity with Yahoo! Mail AddressGuard http://antispam.yahoo.com/whatsnewfree
