[lug] routing question...

[Bear Giles]

I seem to be missing something - as well as all of the results in my google
searches.

I'm trying to route traffic from my home system (with dual 4k monitors) to
my work laptop and then onto the corporate VPN. I *could* set up the VPN on
my home system but would prefer the control of setting up my own routing.
E.g., I don't want the VPN to be my default route to the internet at large
- esp. since I only use the VPN to access an AWS walled garden.

I have a similar situation when I lose my home comcast connection. I can
usually still get out - either a comcast hotspot or a tethered phone/tablet
- and my entire network could get out if I could temporarily change the
default route to go through that system. (Not all of my systems have wifi.)
I haven't had any luck though and I think it's the same problem I'm seeing
today.

This should be pretty straightforward. On the laptop I entered

   $ sudo sysctl -w net.ipv4.ip_forward=1

and on my home system I entered

   $ sudo ip route add 172.28.0.0/16 via 192.168.1.100 proto static

where 192.168.1.100 is the laptop.

I've verified that the route is listed in both `ip route` and `netstat -r`.

However I can't reach the walled garden. In fact if run

   $ traceroute 172.27.10.10

it reports the first hop as 192.168.1.1, not 192.168.1.100.

Am I missing a step? I thought these changes took effect immediately but
maybe I need to bounce something. E.g., I know I probably need to set up a
NAT for the comcast or tethered connection, but I can assign my own IP
address in the 172.28.0.0/16 CIDR so that's not an issue. I also don't see
how that would affect the first hop chosen in traceroute.

Thanks
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