[Elphel-support] What a strange issue

[jeff witz]

Hello,

We try to investigate the external trigger mode for the camera in order to
ba able to synchronize it with a lazer plan for Particule Images
Velocimetry.

It is well known that when this mode is not well mastered the grabber freeze
forcing a hard reset to use it again.

As I have a POE switch, I would benefit from the internet connection using
it.

So I first configure my ehternet board with ifconfig and route, and then I
add the camera domain, using

ifconfig eth0 add 192.168.0.8

This command creates a sub device eth0:0

I thought I was able to use the camera and search on the internet.

I haven't realize that the camera was visible form the entire University
network, beacause of the netmask and gw used for the internet connection.

So finally I have this if config settings

eth0    Link encap:Ethernet  HWaddr 00:40:45:34:6d:7a
          inet adr:134.206.140.221  Bcast:134.206.255.255
Masque:255.255.0.0
          adr inet6: fe80::240:45ff:fe34:6d7a/64 Scope:Lien
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:1209670 erreurs:0 :0 overruns:0 frame:0
          TX packets:154249 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000
          Octets reçus:655241447 (655.2 MB) Octets transmis:15551370 (15.5
MB)
          Interruption:30 Adresse de base:0x8000

eth0:0 Link encap:Ethernet  HWaddr 00:40:45:34:6d:7a
          inet adr:192.168.0.8  Bcast:134.206.255.255  Masque:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interruption:30 Adresse de base:0x8000

lo        Link encap:Boucle locale
          inet adr:127.0.0.1  Masque:255.0.0.0
          adr inet6: ::1/128 Scope:Hôte
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          Packets reçus:843 erreurs:0 :0 overruns:0 frame:0
          TX packets:843 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:0
          Octets reçus:82033 (82.0 KB) Octets transmis:82033 (82.0 KB)

virbr0   Link encap:Ethernet  HWaddr 86:81:1b:f1:1a:b8
          inet adr:192.168.122.1  Bcast:192.168.122.255
Masque:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
          TX packets:165 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:0
          Octets reçus:0 (0.0 B) Octets transmis:34160 (34.1 KB)

So I join you the picture I have after rebooting the camera. It seems that
this camera was detected as a security camera and flashed by the security
LAN I assume that it's due to the use of the same processor.

I finally have to flash the camera to get a working system.

So I try to known if there is a proper way to get a "secure" network.
I find that it is possible to set the sub device eth0:0 broadcast address
using this command :

sudo ifconfig eth0:0 broadcast 192.168.0.255

Using this command I finally get a configuration that seems correct :

eth0    Link encap:Ethernet  HWaddr 00:40:45:34:6d:7a
          inet adr:134.206.140.221  Bcast:134.206.255.255
Masque:255.255.0.0
          adr inet6: fe80::240:45ff:fe34:6d7a/64 Scope:Lien
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:1226403 erreurs:0 :0 overruns:0 frame:0
          TX packets:156760 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000
          Octets reçus:657944898 (657.9 MB) Octets transmis:16070521 (16.0
MB)
          Interruption:30 Adresse de base:0x8000

eth0:0 Link encap:Ethernet  HWaddr 00:40:45:34:6d:7a
          inet adr:192.168.0.8  Bcast:192.168.0.255  Masque:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interruption:30 Adresse de base:0x8000

lo        Link encap:Boucle locale
          inet adr:127.0.0.1  Masque:255.0.0.0
          adr inet6: ::1/128 Scope:Hôte
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          Packets reçus:877 erreurs:0 :0 overruns:0 frame:0
          TX packets:877 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:0
          Octets reçus:85106 (85.1 KB) Octets transmis:85106 (85.1 KB)

virbr0   Link encap:Ethernet  HWaddr 86:81:1b:f1:1a:b8
          inet adr:192.168.122.1  Bcast:192.168.122.255
Masque:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
          TX packets:167 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:0
          Octets reçus:0 (0.0 B) Octets transmis:34685 (34.6 KB)

Do you think this configuration is Ok and risk-less ?

I've been advised that it would be better to buy a usb/ethernet adapter, but
I would prefer master the switch mode. I you think it is too risky I will
buy one of this adapters.


So my purpose with this mail is to find a way to configure properly a LAN
with camera and internet and to underline that we have to be careful when
using the camera on a LAN.

I hope this will prevent people using a PoE switch from bad surprises.

Best regards.





-- 
Jean-François WITZ
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