Re: Networking problems

[Samuel Thibault]

Bruno Haible via Bug reports for the GNU Hurd, le mar. 14 janv. 2025 15:39:45 
+0100, a ecrit:
> Samuel Thibault wrote:
> > > In the default (NAT) configuration of a VirtualBox VM, in all VMs
> > > so far I could "ssh 10.0.2.2" to log into the VM host. With these
> > > new Hurd VMs, this is not the case
> > 
> > Uh? What symptom do you actually get?
> 
> The ssh command hangs.
> 
> Here's a 'ssh -v -v -v' output for 10.0.2.2:
> 
> =======================================================
> OpenSSH_9.2p1 Debian-2, OpenSSL 3.0.8 7 Feb 2023
> debug1: Reading configuration data /home/bruno/.ssh/config
> debug1: Reading configuration data /etc/ssh/ssh_config
> debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf 
> matched no files
> debug1: /etc/ssh/ssh_config line 21: Applying options for *
> debug2: resolve_canonicalize: hostname 10.0.2.2 is address
> debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> 
> '/home/bruno/.ssh/known_hosts'
> debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> 
> '/home/bruno/.ssh/known_hosts2'
> debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling
> debug3: ssh_connect_direct: entering
> debug1: Connecting to 10.0.2.2 [10.0.2.2] port 22.
> debug3: set_sock_tos: set socket 3 IP_TOS 0x10
> =======================================================

So it didn't even manage to establish a tcp connection.

> When I try the debugging advice [1]:
>   # settrans -fga /dev/netdde /hurd/netdde

I don't think the network driver is at stake, but rather the tcp/ip
stack.

> > What does tcpdump say about it?
> 
> How would I use it? I've never used tcpdump before.

tcpdump -n -i /dev/eth0 -s 1500

and you'll get the exchanged packets details.

Samuel