script reconfiguring local interface and cutting off local ssh

[varoudis]

Hi,

I cant find a way to run the script without killing my own link to the system.

On the 'router':
eth0 is on 192.168.166.100 (Im connecting to it from 192.168.166.110 via ssh)
wlan0 is the link to the internet (no firewalls, no VPNs etc.. simple wifi).

I tried both:
sudo lnxrouter -i eth0 -o wlan0
and:
sudo lnxrouter -i eth0 -o wlan0 -g 192.168.166.100

Both killed my link to the 'router' from eth0.
Am I missing something?
Thanks

[garywill]

I guess this is the network you're trying to make:

Internet ---[ wlan0 - router - eth0 ]----- computers

Am I getting it right?

The current script -i eth0 will reset eth0.
To solve this, we need to implement an option to not reset in future version.

BTW, currently can you reconnect to router via ssh after running the command and it resetting?

Before the fix is implemented, there's workaround.
Try comment out these:

linux-router/lnxrouter

Lines 2008 to 2032 in f6995bc

	# initialize subnet interface
	# take subnet interface down first
	ip link set down dev ${SUBNET_IFACE} || die "Failed setting ${SUBNET_IFACE} down"
	# flush old IPs of subnet interface
	ip addr flush ${SUBNET_IFACE} || die "Failed flush ${SUBNET_IFACE} IP"
	dealwith_mac # setting MAC should be after setting NM unmanaged
	[[ $WIFI_IFACE ]] && check_rfkill_unblock_wifi
	# bring subnet interface up
	ip link set up dev ${SUBNET_IFACE} || die "Failed bringing ${SUBNET_IFACE} up"
	# hostapd , haveged
	[[ $WIFI_IFACE ]] && run_wifi_ap_processes
	# add ipv4 address to subnet interface
	ip -4 addr add ${GATEWAY}/24 broadcast ${GATEWAY%.*}.255 dev ${SUBNET_IFACE} || die "Failed setting ${SUBNET_IFACE} IPv4 address"
	set_ipv6_bits
	# add ipv6 address to subnet interface
	if [[ $IPV6 -eq 1 ]] ; then
	ip -6 addr add ${GATEWAY6}/64 dev ${SUBNET_IFACE} || die "Failed setting ${SUBNET_IFACE} IPv6 address"
	fi

linux-router/lnxrouter

Line 1162 in f6995bc

ip link set down dev ${SUBNET_IFACE}

linux-router/lnxrouter

Line 1158 in f6995bc

ip addr flush ${SUBNET_IFACE}

linux-router/lnxrouter

Line 1169 in f6995bc

restore_interface_status

Then run

sudo lnxrouter -i eth0  -g 192.168.166.100

(Notice this is a dirty workaround for your current use case only, not a true fix)
I haven't tested.

[varoudis]

hi and thanks for the quick response!

This is my actual setup.
Internet ---[ wlan0 - router (PiZero2) - usb0 ]----- just one computer - ethernet over USB
I have the feeling that the reset if killing the usb0 (gadget mode) and is not coming back at all...

Ill check you temp fix.
Best
Tasos

[varoudis]

@garywill

This is what I got:

sudo ./lnxrouter -i usb0 -g 192.168.166.100                                                                                          1 ⨯
linux-router 0.6.6 (https://github.com/garywill/linux-router)
Released under LGPL, with no warranty. Use on your own risk.

PID: 1075
Target interface is usb0 (3a:ea:66:54:bc:a2)
RTNETLINK answers: File exists
Error occured

ERROR: Failed setting usb0 IPv4 address



Doing cleanup..
Undoing iptables changes ..
Exiting: This is the only running instance
Cleaning up done

and:

sudo ./lnxrouter -i usb0 -o wlan0 -g 192.168.166.100
[sudo] password for kali:
linux-router 0.6.6 (https://github.com/garywill/linux-router)
Released under LGPL, with no warranty. Use on your own risk.

PID: 991
Target interface is usb0 (3a:ea:66:54:bc:a2)
RTNETLINK answers: File exists
Error occured

ERROR: Failed setting usb0 IPv4 address



Doing cleanup..
Undoing iptables changes ..
Exiting: This is the only running instance
Cleaning up done

With your edits above.
Thanks

[garywill]

Sorry for inconvinence. Try branch https://github.com/garywill/linux-router/tree/workaround-31