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I have a 3com 3CRWER100-75 router. I have seen a new firmware version - 1.3.14. Downloaded it from the 3Com site, unzipped it and started the upgrade. After 2% have been transferred, the connection stalled. After a good 15 Minutes, I tried to restart the router, but lost connection. Pressed the reset button for (more than) 5 seconds, but no reset effect is seen on the leds afterwards. After power off and on - no connection. On its bootup, the leds play a little, and with a sniffer I can see that the router sends the 3 ARP who has messages: "Who Has 10.10.12.72". It does not respond to pings (no matter if the ping is sent to the manual designated "default" 192.168.1.1 or to 10.10.12.72). Any ideas how to get the damn thing back to a useful state?

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  • Amit Dar Jul 28, 2010

    Very knowledgable, but unfortunately no cigar.
    It seems that if the problem is sourced in a defective product, it is sometimes too hard to solve.

    Anyway, Tahnx for the help.

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Base from the description of your problem the router got corrupted because of the unsuccessful firmware upgrade, so lets do here a different way of reset , follow this steps Press and hold the reset button for 30 seconds and while you're still holding the reset button unplug the power of the router for 5 seconds but don't let go the reset button yet after 5 seconds power it back on and then let go with the reset button.
Then after that check the IP address of the computer that is connected to the router wired and then try to ping the default gateway.

Posted on Jul 28, 2010

  • 3 more comments 
  • Amit Dar Jul 28, 2010

    Hi, thanks for the prompt reply. Unfortunately no cigar. The router does respond to pulling the power jack out (...) bit does not seem to respond to anything else - especially not to start pressing or releasing the reset button. The only change I can see is addition of two more ARP "Who Has 10.10.12.72" message sent by the router, summing up to 5 instead of 3.
    The router does not respond to ping messages (both to 192,168.1.1 and to 10.10.12.72), nor does it respond to any messages sent on the local net (DHCP and others).
    I have opened the plastic cover to see the circuit, and found the following:
    The main chip is IP175C LF which is an SOC implementing a switch.
    The only other chips (leaving aside the covered RF zone,and a few analog filters and transistors) is NT5SV8M16DS - 6K that seems to be an SDRAM.
    and 25P32V6P that seems to be the serial FLASH
    I can see a non populated 9 pin port that may embed a JTAG connection.
    Not much to work with, I'm afraid.
    Any more ideas?

  • Mark Gil
    Mark Gil Jul 28, 2010

    OK can you tell me first what is the IP address that the computer is getting when connected wired to the router.

  • Amit Dar Jul 28, 2010

    Thanx again.
    here is the scenarion recorded by EtherRael after router power up (the router is connected to the PC only, and the PC nic is set to DHCP - automatic detection of all):
    ------------------------------------------------------------------------------------------------------------------------------------------------

    No. Time Source Destination Protocol Info
    1 0.000000 3comEuro_fb:73:2c Broadcast ARP Who has 10.10.12.72? Gratuitous ARP


    Frame 1 (60 bytes on wire, 60 bytes captured)
    Ethernet II, Src: 3comEuro_fb:73:2c (00:0f:cb:fb:73:2c), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Address Resolution Protocol (request/gratuitous ARP)


    No. Time Source Destination Protocol Info
    2 0.302380 3comEuro_fb:73:2c Broadcast ARP Who has 10.10.12.72? Gratuitous ARP


    Frame 2 (60 bytes on wire, 60 bytes captured)
    Ethernet II, Src: 3comEuro_fb:73:2c (00:0f:cb:fb:73:2c), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Address Resolution Protocol (request/gratuitous ARP)


    No. Time Source Destination Protocol Info
    3 0.604778 3comEuro_fb:73:2c Broadcast ARP Who has 10.10.12.72? Gratuitous ARP


    Frame 3 (60 bytes on wire, 60 bytes captured)
    Ethernet II, Src: 3comEuro_fb:73:2c (00:0f:cb:fb:73:2c), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Address Resolution Protocol (request/gratuitous ARP)


    No. Time Source Destination Protocol Info
    4 0.645439 0.0.0.0 255.255.255.255 DHCP DHCP Discover - Transaction ID 0xfba7b186


    Frame 4 (342 bytes on wire, 342 bytes captured)
    Ethernet II, Src: CompalEl_49:d3:cd (00:0f:b0:49:d3:cd), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Internet Protocol, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
    User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    Bootstrap Protocol


    No. Time Source Destination Protocol Info
    5 0.907386 3comEuro_fb:73:2c Broadcast ARP Who has 10.10.12.72? Gratuitous ARP


    Frame 5 (60 bytes on wire, 60 bytes captured)
    Ethernet II, Src: 3comEuro_fb:73:2c (00:0f:cb:fb:73:2c), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Address Resolution Protocol (request/gratuitous ARP)


    No. Time Source Destination Protocol Info
    6 1.209795 3comEuro_fb:73:2c Broadcast ARP Who has 10.10.12.72? Gratuitous ARP


    Frame 6 (60 bytes on wire, 60 bytes captured)
    Ethernet II, Src: 3comEuro_fb:73:2c (00:0f:cb:fb:73:2c), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Address Resolution Protocol (request/gratuitous ARP)


    No. Time Source Destination Protocol Info
    7 1.512188 3comEuro_fb:73:2c Broadcast ARP Who has 10.10.12.72? Gratuitous ARP


    Frame 7 (60 bytes on wire, 60 bytes captured)
    Ethernet II, Src: 3comEuro_fb:73:2c (00:0f:cb:fb:73:2c), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Address Resolution Protocol (request/gratuitous ARP)


    No. Time Source Destination Protocol Info
    8 1.814554 3comEuro_fb:73:2c Broadcast ARP Who has 10.10.12.72? Gratuitous ARP


    Frame 8 (60 bytes on wire, 60 bytes captured)
    Ethernet II, Src: 3comEuro_fb:73:2c (00:0f:cb:fb:73:2c), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Address Resolution Protocol (request/gratuitous ARP)


    No. Time Source Destination Protocol Info
    9 3.646679 0.0.0.0 255.255.255.255 DHCP DHCP Discover - Transaction ID 0xfba7b186


    Frame 9 (342 bytes on wire, 342 bytes captured)
    Ethernet II, Src: CompalEl_49:d3:cd (00:0f:b0:49:d3:cd), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Internet Protocol, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
    User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    Bootstrap Protocol


    No. Time Source Destination Protocol Info
    10 11.649232 0.0.0.0 255.255.255.255 DHCP DHCP Discover - Transaction ID 0xfba7b186


    Frame 10 (342 bytes on wire, 342 bytes captured)
    Ethernet II, Src: CompalEl_49:d3:cd (00:0f:b0:49:d3:cd), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Internet Protocol, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
    User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    Bootstrap Protocol


    No. Time Source Destination Protocol Info
    11 26.655984 0.0.0.0 255.255.255.255 DHCP DHCP Discover - Transaction ID 0xfba7b186


    Frame 11 (342 bytes on wire, 342 bytes captured)
    Ethernet II, Src: CompalEl_49:d3:cd (00:0f:b0:49:d3:cd), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Internet Protocol, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
    User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    Bootstrap Protocol

  • Mark Gil
    Mark Gil Jul 28, 2010

    Try to set static IP address on your computer that is wired to the router with this range 192.168.1.X and then try to PING it again, but if still not being able to PING a firmware flash here using JTAG is the next thing that you can do.

  • Amit Dar Jul 28, 2010

    Thanx.
    I have already tried setting the PCs nic to static 192.168.1.X - to no avail.


    Do you have by any chance a link to anywhere that suggests or describes the JTAG to use for this router? Could not find it in 3COM's site. In addition, assuming I can get the appropriate JTAG adapter, do you know where to get a JTAG loadable version of the router firmware?

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