Trouble to access external device server


At work, we have 2 serial printers that are connected to an external device server (MSS4 Lantronix). This device is connected to a small unmanaged switch, along with a pc1, then to our network in the main switch.

From pc1, everything works fine, printing and pinging the MSS4, and getting anywhere in the network.

From another pc in the office, I can ping pc1, but I can't ping the MSS4. If i remove the unmanaged switch, and connect the MSS4 directly in the main switch, then everything works.

Any idea ?


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Ben HartCommented:
Is the MSS4 on a different subnet than the rest of the network?
ti-guyAuthor Commented:
it is on the same vlan. This is the config of the port in the switch :

FastEthernet0/35 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 001c.b17d.61a3 (bia 001c.b17d.61a3)
  Description: Bureau Claire
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:01, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 8000 bits/sec, 7 packets/sec
     523227 packets input, 333203376 bytes, 0 no buffer
     Received 125164 broadcasts (0 multicast)
     0 runts, 0 giants, 0 throttles
     1 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 110857 multicast, 0 pause input
     0 input packets with dribble condition detected
     11872105 packets output, 1569321480 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out
Ben HartCommented:
Here's an idea.. run Wireshark on pc1, then re-attempt to ping MSS4 from the main network segment.  Maybe the MSS4 has a ttl of 1?

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