Testing network

[jmkerdal]

Hello,

I'm trying to test how network work.

I use Debian 11 with QEMU. I see an interesting code here: https://github.com/pandax381/xv6-net
It's OK to compile and starting. But nothing work with TCP.

This is what I have on this computer:

ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:db:97:1c brd ff:ff:ff:ff:ff:ff
altname enp2s1
inet 192.168.1.128/24 brd 192.168.1.255 scope global dynamic noprefixroute ens33
valid_lft 42862sec preferred_lft 42862sec
inet6 2a01:e0a:2d8:6500a62a:dc50:cc03/64 scope global temporary dynamic
valid_lft 86147sec preferred_lft 85755sec
inet6 2a01:e0a:2d8:6500:20cfedb:971c/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 86147sec preferred_lft 86147sec
inet6 fe80::20cfedb:971c/64 scope link noprefixroute
valid_lft forever preferred_lft forever

I see on QEMU documentation that the default IP is 10.0.2.2 so I try this with XV6:

ifconfig net1 10.0.2.2 netmask 255.255.255.0
ifconfig net1 up
tcpechoserver&

And on a another console this:

echo "Hello TCP" > /dev/tcp/10.0.2.2/10007

Nothing append. I try another IP it's equal. Can you help me with this?
In another hand if you have a good tutorial/code that's work with Debian/QEMU?

[jmkerdal]

After multiple test found: this need a fresh Install to work. And it's fragile!