RE: Cannot ssh a raspbian guest from the host

[adarmon]

This is not the issue. This is the output of the iptables -L command:

        Chain INPUT (policy ACCEPT)
        target     prot opt source               destination

        Chain FORWARD (policy ACCEPT)
        target     prot opt source               destination

        Chain OUTPUT (policy ACCEPT)
        target     prot opt source               destination

I think that the issue is related to the network definition of the qemu 
instance. The ifconfig returns:
        eth0      Link encap:Ethernet  HWaddr 52:54:00:12:34:56
                  inet addr:169.254.62.131  Bcast:169.254.255.255  
Mask:255.255.0.0
                  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
                  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
                  TX packets:31 errors:0 dropped:0 overruns:0 carrier:0
                  collisions:0 txqueuelen:1000
                  RX bytes:0 (0.0 B)  TX bytes:6206 (6.0 KiB)
                  Interrupt:57 Base address:0x8000 DMA chan:ff

        lo        Link encap:Local Loopback
                  inet addr:127.0.0.1  Mask:255.0.0.0
                  UP LOOPBACK RUNNING  MTU:65536  Metric:1
                  RX packets:128 errors:0 dropped:0 overruns:0 frame:0
                  TX packets:128 errors:0 dropped:0 overruns:0 carrier:0
                  collisions:0 txqueuelen:1
                  RX bytes:10368 (10.1 KiB)  TX bytes:10368 (10.1 KiB)

I think that I have to add some networking options to the qemu-system-arm 
command:
qemu-system-arm -no-reboot -curses -kernel 
/home/ubuntu/qemu_vms/kernel-qemu-4.4.34-jessie -cpu arm1176 -m 256 -M 
versatilepb -serial stdio -append root=/dev/sda2 panic=1 rootfstype=ext4 rw 
console=ttyAMA0 -drive 
format=raw,file=/home/ubuntu/qemu_vms/shield.img,index=0,media=disk -netdev 
user,id=shield,hostfwd=tcp::5022-:22 -net nic

Do you have an idea?

Thanks,
Avraham

-----Original Message-----
From: Jeremy Payne <address@hidden> 
Sent: Monday, November 18, 2019 5:43 PM
To: address@hidden
Cc: address@hidden
Subject: Re: Cannot ssh a raspbian guest from the host

what does iptables look like on your ssh server ?

iptables -L

as a test flush your rules and retry.

iptables -F


On Sun, Nov 17, 2019 at 10:17 AM <address@hidden> wrote:
>
> Hi,
>
>
>
> Using QEMU, I emulate a raspberry on an AWS EC2 ubuntu instance and I am 
> unable to ssh the raspberry instance from the ubuntu using the command:
>
> ssh pi@localhost -p 8022
>
>
>
> This is the version of QEMU that I used:
>
> QEMU emulator version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.20)
>
> Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project 
> developers
>
>
>
> This is the command I used to run the Raspbian instance:
>
> sudo qemu-system-arm -no-reboot -curses -kernel 
> /home/ubuntu/qemu_vms/kernel-qemu-4.4.34-jessie -cpu arm1176 -m 256 -M 
> versatilepb -serial stdio -append root=/dev/sda2 panic=1 
> rootfstype=ext4 rw console=ttyAMA0 -drive 
> format=raw,file=/home/ubuntu/qemu_vms/2017-03-02-raspbian-jessie.img,i
> ndex=0,media=disk -netdev 
> user,id=shield,hostfwd=tcp:127.0.0.1:8022-:22 -net nic
>
>
>
> This is the output of the ssh command: ssh pi@localhost -p 8022 -v
>
> OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n  7 Dec 2017
>
> debug1: Reading configuration data /etc/ssh/ssh_config
>
> debug1: /etc/ssh/ssh_config line 19: Applying options for *
>
> debug1: Connecting to localhost [127.0.0.1] port 8022.
>
> debug1: Connection established.
>
> debug1: key_load_public: No such file or directory
>
> debug1: identity file /home/ubuntu/.ssh/id_rsa type -1
>
> debug1: key_load_public: No such file or directory
>
> debug1: identity file /home/ubuntu/.ssh/id_rsa-cert type -1
>
> debug1: key_load_public: No such file or directory
>
> debug1: identity file /home/ubuntu/.ssh/id_dsa type -1
>
> debug1: key_load_public: No such file or directory
>
> debug1: identity file /home/ubuntu/.ssh/id_dsa-cert type -1
>
> debug1: key_load_public: No such file or directory
>
> debug1: identity file /home/ubuntu/.ssh/id_ecdsa type -1
>
> debug1: key_load_public: No such file or directory
>
> debug1: identity file /home/ubuntu/.ssh/id_ecdsa-cert type -1
>
> debug1: key_load_public: No such file or directory
>
> debug1: identity file /home/ubuntu/.ssh/id_ed25519 type -1
>
> debug1: key_load_public: No such file or directory
>
> debug1: identity file /home/ubuntu/.ssh/id_ed25519-cert type -1
>
> debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
>
> ssh_exchange_identification: read: Connection reset by peer
>
>
>
> I already validated that:
>
> The ssh service is running in the Raspbian instance.
> In /etc/sshd_config, PasswordAuthentication is set to yes From the 
> Raspbian instance itself, ssh pi@locahost works fine Ifconfig returns:
>
> eth0      Link encap:Ethernet  HWaddr 52:54:00:12:34:56
>
>           inet addr:169.254.62.131  Bcast:169.254.255.255  
> Mask:255.255.0.0
>
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>
>           TX packets:46 errors:0 dropped:0 overruns:0 carrier:0
>
>           collisions:0 txqueuelen:1000
>
>           RX bytes:0 (0.0 B)  TX bytes:12452 (12.1 KiB)
>
>           Interrupt:57 Base address:0x8000 DMA chan:ff
>
>
>
> lo        Link encap:Local Loopback
>
>           inet addr:127.0.0.1  Mask:255.0.0.0
>
>           UP LOOPBACK RUNNING  MTU:65536  Metric:1
>
>           RX packets:279 errors:0 dropped:0 overruns:0 frame:0
>
>           TX packets:279 errors:0 dropped:0 overruns:0 carrier:0
>
>           collisions:0 txqueuelen:1
>
>           RX bytes:25786 (25.1 KiB)  TX bytes:25786 (25.1 KiB)
>
>
>
> Can you please help me in this issue?
>
>
>
> Thanks,
>
> Avraham
>
>