[Info-vax] [7.3 VAX] XDM configuration

[JKB]

Le 17-11-2022, chris <chris-nospam at tridac.net> a écrit :
>
> I would use wireshark or tcpdump to monitor the src and dest hosts, so
> you can analyse the traffic. Used recently here to debug a vnc 
> connection, both network and local loopback, which xdmcp makes use of...

	Xephyr runs fine. I can access to legendre.systella.fr with:
	Xephyr :1 -listen tcp -query legendre

	If I tri to access to fermat (this VAX), I only obtain a black
	screen. But it seems to answer to request:

Root hilbert:[~] > tcpdump -p -i eth0 -vvv host fermat
tcpdump: listening on eth0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
09:06:58.114604 IP (tos 0x0, ttl 64, id 39927, offset 0, flags [DF], proto UDP (17), length 35)
    hilbert.systella.fr.39124 > fermat.systella.fr.xdmcp: [udp sum ok] UDP, length 7
09:06:58.246108 IP (tos 0x0, ttl 30, id 37659, offset 0, flags [DF], proto UDP (17), length 75)
    fermat.systella.fr.xdmcp > hilbert.systella.fr.39124: [udp sum ok] UDP, length 47
09:06:58.246283 IP (tos 0x0, ttl 64, id 39952, offset 0, flags [DF], proto UDP (17), length 134)
    hilbert.systella.fr.39124 > fermat.systella.fr.xdmcp: [bad udp cksum 0x96a6 -> 0x899a!] UDP, length 106
09:06:59.483783 IP (tos 0x0, ttl 30, id 37660, offset 0, flags [DF], proto UDP (17), length 80)
    fermat.systella.fr.xdmcp > hilbert.systella.fr.39124: [udp sum ok] UDP, length 52
09:06:59.483837 IP (tos 0x0, ttl 64, id 40214, offset 0, flags [DF], proto UDP (17), length 57)
    hilbert.systella.fr.39124 > fermat.systella.fr.xdmcp: [bad udp cksum 0x9659 -> 0xb434!] UDP, length 29
09:07:01.485945 IP (tos 0x0, ttl 64, id 40658, offset 0, flags [DF], proto UDP (17), length 57)
    hilbert.systella.fr.39124 > fermat.systella.fr.xdmcp: [bad udp cksum 0x9659 -> 0xb434!] UDP, length 29
09:07:05.488721 IP (tos 0x0, ttl 64, id 41488, offset 0, flags [DF], proto UDP (17), length 57)
    hilbert.systella.fr.39124 > fermat.systella.fr.xdmcp: [bad udp cksum 0x9659 -> 0xb434!] UDP, length 29
09:07:06.672721 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has fermat.systella.fr tell hilbert.systella.fr, length 28
09:07:06.702501 ARP, Ethernet (len 6), IPv4 (len 4), Reply fermat.systella.fr is-at 08:00:2b:7a:39:2e (oui Unknown), length 46
^C
9 packets captured
633 packets received by filter
0 packets dropped by kernel

	Of course, xdm is running :

$ pipe show sys | search SYS$INPUT XDM
00000113 TCPIP$XDM_1     LEF     10      532   0 00:00:10.72      2123   2109  N

	I suppose my xdm configuration is faulty somewhere.

	Best regards,

	JKB

-- 
Si votre demande me parvient en code 29, je vous titiouillerai volontiers
une réponse.