What are the destination addresses that are being forwarded?
Broadcasts shouldn't be forwarded, but the router needs to know that they're
broadcast addresses. It'll only recognize 10.1.255.255 and 10.2.255.255 as
broadcast addresses. If a system is sending requests to, say, 10.1.12.255
where a system is set up as a /24, that address is recognized as a perfectly
valid address and will be forwarded.
Justin
On Jan 22, 2008 1:01 PM, <[EMAIL PROTECTED]> wrote:
>
> I've set up a very basic router with only two interfaces: eth0 is my
> 10.1.0.0 subnet and eth1 is my 10.2.0.0 subnet. The router's default gateway
> is my Internet router. The subnets are in different buildings on our campus
> connected via a wireless link. I use them mainly in conjunction with
> Windows Server 2003 sites to control replication of the of the Active
> Directory and the Distributed File System set up for user home folders.
> Internet access, internal routing between my two subnets, and replication of
> the AD and DFS work fine.
>
> My problem is that dhcp request broadcasts are being forwarded to the
> 10.2.0.0 subnet from the 10.1.0.0 subnet. Each subnet has its own dhcp
> server (implemented on 2003 machines not the router). Hosts that should
> receive 10.1.x.x addresses are receiving 10.2.x.x addresses. dhcp
> forwarding is not configured on the router. My understanding from the
> documentation is that the router should automatically block broadcasts. I
> would appreciate any help in discovering what I'm missing. Below is my
> configuration.
>
> Thanks,
> Robert
>
> protocols {
> }
> policy {
> }
> interfaces {
> restore: false
> loopback lo {
> description: ""
> }
> ethernet eth0 {
> disable: false
> discard: false
> description: ""
> hw-id: 00:d0:b7:92:50:b7
> duplex: "auto"
> speed: "auto"
> address 10.1.0.253 {
> prefix-length: 16
> disable: false
> }
> }
> ethernet eth1 {
> disable: false
> discard: false
> description: ""
> hw-id: 00:d0:b7:92:9a:ab
> duplex: "auto"
> speed: "auto"
> address 10.2.0.1 {
> prefix-length: 16
> disable: false
> }
> }
> }
> service {
> webgui {
> http-port: 80
> https-port: 443
> }
> }
> firewall {
> log-martians: "enable"
> send-redirects: "disable"
> receive-redirects: "disable"
> ip-src-route: "disable"
> broadcast-ping: "disable"
> syn-cookies: "enable"
> }
> system {
> host-name: "HSRouter"
> domain-name: ""
> name-server 206.54.112.1
> time-zone: "Denver"
> ntp-server "69.59.150.135"
> gateway-address: 10.1.0.254
> login {
> user root {
> full-name: ""
> authentication {
> encrypted-password: "$1$$Ht7gBYnxI1xCdO/JOnodh."
> }
> }
> user vyatta {
> full-name: ""
> authentication {
> encrypted-password: "$1$$Ht7gBYnxI1xCdO/JOnodh."
> }
> }
> }
> package {
> auto-sync: 1
> repository community {
> component: "main"
> url: "http://archive.vyatta.com/vyatta";
> }
> }
> }
>
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>
>
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