Internet Connection Sharing Xavier

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
1

Hello,

I am having some trouble figuring out what is preventing internet connection sharing from working with a Linux host and the Jetson Xavier NX on a Seeed A203 Carrier Board.

Host information (uname -a):

Linux debian 6.1.0-16-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.67-1 (2023-12-12) x86_64 GNU/Linux

Jetpack Information:

# R35 (release), REVISION: 1.0, GCID: 31346300, BOARD: t186ref, EABI: aarch64, DATE: Thu Aug 25 18:41:45 UTC 2022

Followed the direction in README-usb-dev-mode.txt. So on host with the USB cable connected to the Jetson Xavier ip a s enxf2bfc334e0bc shows:

6: enxf2bfc334e0bc: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 1000
link/ether [...]
inet 192.168.55.100/24 brd 192.168.55.255 scope global dynamic noprefixroute enxf2bfc334e0bc
   valid_lft 10sec preferred_lft 10sec
[...]

So my interface is enxf2bfc334e0bc and IPv4 is 192.168.55.100 I have enabled IP forwarding and added the SNAT rule from the documentation and verified with the following:

 cat /proc/sys/net/ipv4/ip_forward
 1
 sudo iptables -t nat -v -L POSTROUTING -n --line-numbers
 Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes)
 num   pkts bytes target     prot opt in     out     source               destination         
 1       52  7420 SNAT       0    --  *      enxf2bfc334e0bc  0.0.0.0/0            0.0.0.0/0            to:192.168.55.100

The Jetson Xavier is accessible by ssh when logged in the following can be pinged:

  • 192.168.55.100 (enxf2bfc334e0bc)
  • 192.168.1.98 (wifi interface)

However, a ping of 8.8.8.8 , the fallback DNS, fails. And hostname resolution fails. For example:

getent hosts nvidia.com

So no internet access from the Jetson Xaiver over usb.

Notes:

  • I have the other usb interface disabled in NetworkManager.
  • Internet connection sharing with the same software load and Windows 11 is working.

Any ideas on what I might be missing?

Thanks

2

Hi,
This would need other users to check and shar experience. There is ethernet port on Xavier NX developer kit and we generally use it.

The latest Jetpack 5 release is 5.1.2 and it would be great if you can upgrade to latest version.

3

A careful reading of README-usb-dev-mode.txt revealed my mistake:

iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to 192.168.1.100

where:
 eth0 is the name of your host's upstream Ethernet interface.
192.168.1.100 is your host's IP address on that interface.

In my original post the output from iptables was:

sudo iptables -t nat -v -L POSTROUTING -n --line-numbers
Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes)
num   pkts bytes target     prot opt in     out     source               destination         
1       52  7420 SNAT       0    --  *      enxf2bfc334e0bc  0.0.0.0/0            0.0.0.0/0           to:192.168.55.100

But, I should be using my host interface and IP the iptables output should be:

1     383 35456 SNAT       0    --  *      wlp59s0  0.0.0.0/0            0.0.0.0/0            to:192.168.1.98

So using my upstream interface and IP address as described in README-usb-dev-mode.txt resolves this isssue.

In short:

My internet connected interface is wlp59s0 and the IP is 192.168.1.98. So rule for iptables should read:

iptables -t nat -A POSTROUTING -o wlp59s0 -j SNAT --to 192.168.1.98
4

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