Networking :: Please rudimentary Ad-Hoc ifconfig route help.

Perhaps I should dhcpd & dnsmasq.

I know all my hardware is OK from other configurations.

For little money off Ebay, I have a 3G Motorola cellphone & USB cable.
modprobe cdc-acm
/usr/sbin/pppd connect '/usr/sbin/chat -v "" "AT&F" OK "AT+CGDCONT=1,\"IP\",\"LEMONINTERNET\"" OK "ATDT*99#"' noauth /dev/ttyACM0 115200 defaultroute noipdefault user ppp usepeerdns

I want to internet-ppp0-wlan0-AdHoc-laptop/notebook
First, I want to do/learn manually.

First I want to desktop ping -c 1 -n notebook notebook ping desktop.

Desktop wireless PCI card wlan0.
Notebook wireless PCMCIA card eth0.

iwconfig wlan0 mode Ad-Hoc essid violet
ifconfig wlan0 192.168.1.10 netmask 255.255.255.0 up
route add -net 192.168.1.0 netmask 255.255.255.0 wlan0
route add default gw 192.168.1.1 wlan0

iwconfig eth0 mode Ad-Hoc essid violet
ifconfig eth0 192.168.1.11 netmask 255.255.255.0 up
route add -net 192.168.1.0 netmask 255.255.255.0 eth0
route add default gw ? eth0

Please help default gw eth0 ?

Later, I move to netmask ppp0 wlan0 dhcp etc.

original here.