accessing computer across networks

Madd the Sane · 10-26-2007, 07:37 PM

I have a strange set up for my network at home. Basically I have a wireless network and, in my room, a wired network. I'm using a Linksys router for the wireless access point. A better way to show it is like this:

Code:

Internet
   |
   |
Wireless-------------Router(Linux comp)------------hub--------mac
192.168.45.1     192.168.45.2 192.168.47.1             192.168.47.149
    |                                                      (dhcp)
    |
    |
  laptop
192.168.45.100
  (dhcp)

I can ping from the mac to the laptop, but not the other way around.

I've already tried to set up the routing table by adding the following:

Code:

Destination         Mask          Gateway      Metric
192.168.47.0   255.255.255.0   192.168.45.2      2*
192.168.47.1   255.255.255.255 192.168.45.2      2*

*the metric can't be changed.
I can ping the Linux computer from the laptop at 192.168.47.1, but that's the only IP address on that subnet mask that I can ping.

Any ideas?

MS3FGX · 10-26-2007, 08:28 PM

Do you have a firewall running on the Linux router that is blocking incoming ICMP requests perhaps?

Madd the Sane · 10-26-2007, 09:34 PM

I'll check, but it's not just ICMP pings that aren't getting through. Basically, it's only one-way communication, and that kind of confuses me

jschiwal · 10-26-2007, 10:54 PM

I once had a similar setup using the wireless on my laptop to give my desktop internet access. I had the laptop on the 192.168.1.0 subnet and a subnet for the desktop and a network printer of 192.168.1.128.

I don't think you need a host route on the Linux router, but you should have one route for the 192.168.45.0 network and one for the 192.168.47.0 network and a default route with a gateway of 192.168.45.1.

Code:

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.45.0    *               255.255.255.0   U     0      0        0 eth0
192.168.47.0    *               255.255.255.0   U     0      0        0 eth1
loopback        *               255.0.0.0       U     0      0        0 lo
default         192.168.45.1    0.0.0.0         UG    0      0        0 eth0

You might want to check if the "ip_conntrack" module is loaded. ( It might be an alias now for nf_conntrack. )
Also use 192.168.47.1 as the default gateway setting on the Mac.