losing lan connection

[jjb]

hi frank
all the items on the network have a static address:
pc1 ***.***.***.01
pc2 ***.***.***.02
pc3 ***.***.***.03
printer ***.***.***.12
network harddrive ***.***.***.20
profilux piii ***.***.***.08

wireless ports are switched off on the router.
the backup profilux pii (spare just in case) witch i have, never lost its connection and never did in 2 years ***.***.***.07
just set up log reporting on the router to see any changes over the next week.

just tried to login again and its lost it, so i have changed it to ***.***.***.09.just logged in ok, i will see what happens now

[GHL Support]

Ok, the IPs are not the problem.
What about your ProfiLux3 MAC address (six hexadecimal numbers)?

[harmjan]

Hi Frank,

Thanks for your research.
I've checked my IP range again and again, but I don't see a problem:
192.168.178.1 Fritz.Box Router (static)
192.168.178.2 HP Laserjet (static)
192.168.178.20 till 192.168.178.99 DHCP range (5 adresses reserved)
192.168.178.100 Profilux 3 (static)

The MAC Address is also unique [00 50 C2 B8 10 D7].

[harmjan]

Any ideas?

[math]

I also have some trouble with my LAN connection.

My Profilux 3 EX is connected to a managed Cisco switch, when I connected it for the first time, I received errors on the port. This is mostly caused by a failed auto-negotiation. So I forced the port to operate at 10Mbit, this fixed most of my problems. Maybe is it possible to set the duplex and speed settings in the Profilux?

Also I see something stange, what is the MTU value of the Profilux? It should be 1500 bytes. But when I do a ping-test, i can't send packets above 1472 bytes.

macbook-pro-van-math:~ math$ ping -s 1472 192.168.10.200
PING 192.168.10.200 (192.168.10.200): 1472 data bytes
1480 bytes from 192.168.10.200: icmp_seq=0 ttl=100 time=12.303 ms
1480 bytes from 192.168.10.200: icmp_seq=1 ttl=100 time=12.011 ms
1480 bytes from 192.168.10.200: icmp_seq=2 ttl=100 time=12.580 ms
1480 bytes from 192.168.10.200: icmp_seq=3 ttl=100 time=12.260 ms
^C
--- 192.168.10.200 ping statistics ---
4 packets transmitted, 4 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 12.011/12.288/12.580/0.202 ms
macbook-pro-van-math:~ math$ ping -s 1474 192.168.10.200
PING 192.168.10.200 (192.168.10.200): 1474 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
^C
--- 192.168.10.200 ping statistics ---
3 packets transmitted, 0 packets received, 100.0% packet loss

both issues could cause ALOT of problems.

[Matthias]

thanks for the hints, we will check this

[jjb]

hi any update on this ,i have checked just about everything now even setting up a dedicated pc just to th profi and all seems well the for no reason it drop the connection and i have to reset the profi.

[GHL Support]

@math
Our MTU is 1500.
If you try to test the MTU with a ping you have to add 8 bytes for the ICMP header and 20 bytes for the IP header.
If you generate a ping with 1472 data bytes you get: 1472 + 8 + 20 = 1500

[Vatso]

I would suggest checking the Lan Cable & what switch / router is the profilux connected to?

I would try run a ping -t to the ip of the profilux to make sure the network interface is being kept alive.

@ Frank Does the profilux support SNMP?

[GHL Support]

SNMP support isn't available - not implemented.
I could vaguely remember on a web site reporting auto neogation problems with cisco routers or switches. But I'm not sure about it...