Re: Networking problems

[Bruno Haible]

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
=======================================================

And here's the same thing for a different destination:

=======================================================
OpenSSH_9.2p1 Debian-2, OpenSSL 3.0.8 7 Feb 2023
debug1: Reading configuration data /home/bruno/.ssh/config
debug1: /home/bruno/.ssh/config line 2: Applying options for panoramix
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 *
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
debug2: resolving "panoramix" port 22
debug3: resolve_host: lookup panoramix:22
debug3: ssh_connect_direct: entering
debug1: Connecting to 192.168.178.30 [192.168.178.30] port 22.
debug3: set_sock_tos: set socket 3 IP_TOS 0x10
debug1: Connection established.
debug1: identity file /home/bruno/.ssh/id_rsa type -1
debug1: identity file /home/bruno/.ssh/id_rsa-cert type -1
debug1: identity file /home/bruno/.ssh/id_ecdsa type -1
debug1: identity file /home/bruno/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/bruno/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/bruno/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/bruno/.ssh/id_ed25519 type -1
debug1: identity file /home/bruno/.ssh/id_ed25519-cert type -1
debug1: identity file /home/bruno/.ssh/id_ed25519_sk type -1
debug1: identity file /home/bruno/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/bruno/.ssh/id_xmss type -1
debug1: identity file /home/bruno/.ssh/id_xmss-cert type -1
debug1: identity file /home/bruno/.ssh/id_dsa type -1
debug1: identity file /home/bruno/.ssh/id_dsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_9.2p1 Debian-2
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.1
debug1: compat_banner: match: OpenSSH_6.1 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
...
=======================================================

When I try the debugging advice [1]:
  # settrans -fga /dev/netdde /hurd/netdde
  $ ssh 10.0.2.2
  prints some messages from the irq_handler [9]
  and then locks up the machine solid.
  $ ping 8.8.8.8
  likewise

Debugging with gdb shows 2 threads: the main thread doing connect(),
and a second thread waiting for a timeout. As expected.

> What does tcpdump say about it?

How would I use it? I've never used tcpdump before.

Bruno

[1] https://www.debian.org/ports/hurd/hurd-install