When I recently did the same thing, I had to add a 'default' gateway to
the routing table. (the man page for routed has an example). Don't know
if this was the best way, but it worked.
Nic
Matthew Saltzman wrote:
>
> Hi-
>
> I recently got DSL service at home, and I am trying to reconfigure my
> home network to handle everything. This all used to work when I had
> PPP instead of DSL.
>
> The network consists of a Linux box (RH6.2 with updates) that handles
> network services among other tasks, a Win95 box, and a laptop that
> dual-boots RH6.2 and Win2000. Now I also have a hardware gateway for
> DSL. All of this is connected to a central Ethernet hub.
> The Linux box has a single Ethernet card over which I want to run
> interfaces to the local net and the DSL net. So the local net will
> run over eth0 and the DSL net over eth0:0.
>
> The DSL connection includes a small network with address
> xxx.xxx.xxx.xx2, a static IP address for the gateway (xxx.xxx.xxx.xx4)
> and one for the Linux box (xxx.xxx.xxx.xx3). The local net address is
> 192.168.10.0.
>
> /etc/sysconfig/network:
>
> NETWORKING=yes
> FORWARD_IPV4=yes
> HOSTNAME=yankee
> DOMAINNAME=localdomain
> GATEWAY=xxx.xxx.xxx.xx4
> GATEWAYDEV=eth0:0
>
> /etc/sysconfig/network-scripts/ifcfg-eth0:
>
> DEVICE=eth0
> BOOTPROTO=static
> IPADDR=192.168.10.1
> NETMASK=255.255.255.0
> GATEWAY=xxx.xxx.xxx.xx4
> HOSTNAME=yankee
> DOMAIN=localdomain
>
> /etc/sysconfig/network-scripts/ifcfg-eth0:0:
>
> DEVICE=eth0:0
> BOOTPROTO=static
> IPADDR=xxx.xxx.xxx.xx3
> NETMASK=255.255.255.xx2 (appropriate netmask for a two-address subnet)
> GATEWAY=xxx.xxx.xxx.xx4
> HOSTNAME=dsl-xxx-xxx-xxx-xx3.dslprovider.com
> DOMAIN=dslprovider.com
>
> The linux box appears to function correctly. ifconfig reports:
>
> eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
> inet addr:192.168.10.1 Bcast:192.168.10.255
> Mask:255.255.255.0
> UP BROADCAST RUNNING MTU:1500 Metric:1
> RX packets:147908 errors:0 dropped:0 overruns:0 frame:0
> TX packets:111053 errors:0 dropped:0 overruns:0 carrier:0
> collisions:24 txqueuelen:100
> Interrupt:9 Base address:0xe800
>
> eth0:0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
> inet addr:xxx.xxx.xxx.xx3 Bcast:xxx.xxx.xxx.xx5
> Mask:255.255.255.252
> UP BROADCAST RUNNING MTU:1500 Metric:1
> Interrupt:9 Base address:0xe800
>
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> UP LOOPBACK RUNNING MTU:3924 Metric:1
> RX packets:23111 errors:0 dropped:0 overruns:0 frame:0
> TX packets:23111 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
>
> route -n reports:
>
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use Iface
> 192.168.10.1 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
> xxx.xxx.xxx.xx2 0.0.0.0 255.255.255.xx2 U 0 0 0 eth0
> 192.168.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
> 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
> 0.0.0.0 xxx.xxx.xxx.xx4 0.0.0.0 UG 1 0 0 eth0
>
> I can reach internal machines (when they work--see below) and external
> sites with no problem.
>
> The masquerade configuration in /etc/rc.d/rc.local is
>
> /sbin/modprobe ip_masq_ftp
> /sbin/ipchains -P forward DENY
> /sbin/ipchains -A forward -j MASQ -s 192.168.10.0/24 -d 0.0.0.0/0
>
> My laptop in Linux mode correctly DHCP's and can see machines on the
> internal net, but can't see out. The first attempt to ping produces
> the following:
>
> PING <external-ip-address> from 192.168.10.106 : 56(84) bytes of data.
> >From yankee (192.168.10.1): Redirect Host(New nexthop:
>dsl-xxx-xxx-xxx-xx4.dslprovider.com (xxx.xxx.xxx.xx4).
>
> One packet is received and the rest are dropped. Subsequent pings
> just hang.
>
> The routing table on the laptop is:
>
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use Iface
> 192.168.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
> 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
> 0.0.0.0 192.168.10.1 0.0.0.0 UG 0 0 0 eth0
>
> This machine is perfectly functional on other networks I have tried.
>
> /etc/dhcpd.conf on 192.168.10.1 contains:
>
> server-identifier yankee;
> option domain-name "localdomain";
> option routers 192.168.10.1;
> option subnet-mask 255.255.255.0;
> subnet 192.168.10.0 netmask 255.255.255.0{
> range 192.168.10.100 192.168.10.110;
> option domain-name "localdomain";
> option routers 192.168.10.1;
> }
>
> The Win95 machine and the laptop in Win2000 mode both fail to DHCP.
> Log entries look like:
>
> Oct 20 11:42:36 yankee dhcpd: DHCPDISCOVER from xx:xx:xx:xx:xx:xx via eth0
> Oct 20 11:42:37 yankee dhcpd: DHCPOFFER on 192.168.10.106 to xx:xx:xx:xx:xx:xx via
>eth0
> Oct 20 11:42:37 yankee dhcpd: DHCPREQUEST for 192.168.10.106 from xx:xx:xx:xx:xx via
>eth0
> Oct 20 11:42:37 yankee dhcpd: DHCPACK on 192.168.10.106 to xx:xx:xx:xx:xx via eth0
>
> repeated endlessly for Win2000 or once for Win95 (at which point Win95
> reports the failure and gives up).
>
> Any advice would be greatly appreciated. If I need to provide any
> other logs, let me know. Thanks.
>
> Matthew Saltzman
> Clemson University Math Sciences
> [EMAIL PROTECTED]
> http://www.math.clemson.edu/~mjs
>
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