Date: Mon, 19 Jul 1999 11:18:39 -0400 From: "James Gill" <gill@topsecret.net> To: <freebsd-net@freebsd.org> Subject: tomorrow a gateway... Message-ID: <NDBBJDFMIMOCFNNCEKADOELECJAA.gill@topsecret.net>
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Hello :) I am new to FreeBSD and I'm working a FBSD 486 into my home network to act as a router and firewall, NAT, etc. but It's not quite ready yet. In the interim, I have both NICs in the machine and up on the same subnet and I keep getting these messages on the console: Jul 19 10:45:75 hostname /kernel: arp: 10.10.10.33 is on ed1 but got reply from 00:a0:24:23:78:e0 on ed0 It should be noted that the MAC address shown does correspond to the IP address, so that's all working fine. I think I understand the message; one NIC is ARPing for an IP and the other NIC is picking up the response thus confusing the host. It seems that this won't be a problem when I move to separate subnets, but having never set up a gateway before I don't think I'm ready to plop this machine in between my live network and the outside world. I think my question can be distilled down to: What do I have to know extra when putting two NICs of the same subnet in one host? Some more info: the network is connected up stream by an ISDN router that will be set to pass incoming packets to a single host, this will be the router box I'm working on. I am using an internal 10.*.*.* network, but only one class-C subnet of it. 10.10.10.* with a subnet mask of 255.255.255.192 dividing my network into four subnets. Here's what I got out of rfc1878 that I based all this on: Table 1-2 represents traditional subnetting of a Class C network address (which is identical to extended Class B subnets). Subnet Mask # of nets Net. Addr. Host Addr Range Brodcast Addr. Bits of Subnet hosts/subnet 255.255.255.192 4 nets N.N.N.0 N.N.N.1-62 N.N.N.63 2 bit Class C 62 N.N.N.64 N.N.N.65-126 N.N.N.127 10 bit Class B N.N.N.128 N.N.N.129-190 N.N.N.191 N.N.N.192 N.N.N.193-254 N.N.N.255 Currently, everything is in the first subnet, and when the gateway is activated, the internal stuff will be moved into the third subnet (by simply adding 100 to the host address). ...so currently the gateway has .2 and .29 and internal addresses are .30 - .33 but the gateway's internal interface will be .129 and internal will be .130 - .133 . Thanks in advance for any help... ===================================== James Gill * http://www.topsecret.net ===================================== To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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