[Oberon] Re (8?): Networking ETH Oberon on QEMU.

[Jörg]

Peter

debugging IP routing problems from remote is not an easy task (
You're using sudo --> okay
You're using NAT / MASQUERADEing --> okay (For wired it would be possible to put eth0 and tap0 in a bridge. Then no NAT needed).

Can it be that FTP and SSH ports are blocked somewhere in your setup?

br
Jörg


Am 09.07.20, 16:41 schrieb "oberon-bounces at lists.inf.ethz.ch im Auftrag von peter at easthope.ca" <oberon-bounces at lists.inf.ethz.ch im Auftrag von peter at easthope.ca>:

    From:	=?utf-8?Q?J=C3=B6rg?= <joerg.straube at iaeth.ch>
    Date:	Thu, 9 Jul 2020 06:53:27 +0200
    > Is your host connectivity to the internet wired (eth0) or wireless (wlan0)?
    
    Wireless, wlan0.  
    
    eth0 is the socket on the mainboard and has no cable plugged.
    
    > - When wired, is your tap and eth0 in a bridge?
    
    No cable is plugged at eth0.  I haven't intended to define any bridge.  
    
    This is the start script and execution thereof.
    
    #!/bin/bash 
    # Script etho to start ETH Oberon on QEMU with system and working directories
    # in a removable flash store. 
    Sysdev=/dev/KingstonCF
    echo Sysdev is $Sysdev.
    if test -b $Sysdev
    then
      sudo qemu-system-i386 -drive file=$Sysdev,format=raw \
        -netdev tap,id=tap0 \
        -device ne2k_pci,netdev=tap0
        # -nic tap,ipv6-off,model=ne2k_pci
    else
      echo $WorkingVolume containing working files not connected.  Aborting.
    fi
    
    peter at joule:~$ ./etho
    Sysdev is /dev/KingstonCF.
    [sudo] password for peter: 
    W: /etc/qemu-ifup: no bridge for guest interface found
    
    [ETH Oberon 2.3.7 appears.]
    
    > - When wireless, you can╢t use tap you have to use NAT and portforwardings
    
    That pertains to connection to the Internet; correct?  
    
    Telnet from Oberon guest to QEMU host works.  Both of these work.
    
    Desktops.OpenDoc telnet://peter@joule/ ~
    Desktops.OpenDoc telnet://peter@172.23.8.1/ ~
    
    Also HTTP works!
    
    Desktops.OpenDoc http://google.ca/ 
    
    Google finds https://en.wikipedia.org/wiki/Oberon_(operating_system) .
    Can't open the HTTPS of course.
    
    FTP and SSH from the QEMU guest to the QEMU host don't work.  They give the 
    results reported previously.  
    
    I don't understand the significance of the note about bridge from QEMU.
    W: /etc/qemu-ifup: no bridge for guest interface found
    
    "W" is warning; correct?  Is a bridge necessary?  If so, why do telnet and 
    http work without it.
    
    > I forgot to mention: with tap, qemu must run as root.
    
    Yes, the script above has sudo.
    
    > See also here: https://wiki.qemu.org/Documentation/Networking/NAT
    
    The Linux host providing QEMU has shorewall and has served as LAN 
    router for years.  /etc/shorewall/zones puts tap0 is in the local 
    zone. The only peculiarity is that interfaces except tap0 are named 
    Loc<name>.  The "Loc" prefix signifies the loc zone for shorewall.  
    
    # joule:/etc/shorewall/interfaces
    #ZONE INTERFACE BROADCAST OPTIONS
    #net   eth0      detect    optional,dhcp,tcpflags,routefilter,nosmurfs,logmartians
    net   wlan0     detect    optional,dhcp,tcpflags,routefilter,nosmurfs,logmartians
    loc   Loc+      detect    tcpflags,nosmurfs,routeback
    loc   ppp+      detect    tcpflags,nosmurfs,routeback
    loc   tap0      detect    tcpflags,nosmurfs,routeback
    # This is for the tunnel.
    vpn   tun0      -         routeback
    #LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE
    
    And this for SNAT.
    
    # joule:/etc/shorewall/snat
    #ACTION          SOURCE  DEST PROTO    PORT
    #
    # Rules generated from masq file /etc/shorewall/masq by Shorewall 5.2.3.2 - Mon 18 Nov 2019 07:05:37 PM PST
    #
    MASQUERADE      172.23.0.0/16   wlan0
    
    The problem with FTP and SSH is more subtle?  Some interclicks in the 
    QEMU based Oberon don't work if clicked too quickly.  Eg. MM, MM+MR 
    fails to copy a line if clicked rapidly.  If clicked with a short 
    pause it works.  I don't understand FTP and SSH well enough; is timing 
    significant?
    
    Thanks,                                   ... P.
    
    -- 
    https://en.wikibooks.org/wiki/Medical_Machines
    https://en.wikibooks.org/wiki/Oberon
    Tel: +1 604 670 0140            Bcc: peter at easthope. ca
    
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