Dear all,
I have a Netgear WNDR3700v2 with OpenWRT. The problem is that I created
a custom boot script as explained here
(http://wiki.openwrt.org/doc/techref/initscripts) and after rebooting I
was not able to connect to the router.
What the custom script contained was the following:
------------------------------------------------------------------------------------------
# Start fprobe to send NetFlow reports to ntop
fprobe -ibr-lan 192.168.1.22:2055
# Start QoS scripts (the script described here:
http://www.campsmur.cat/dani_home_network.html)
# Start the openVPN server, configured according to here:
http://wiki.openwrt.org/inbox/vpn.howto.
------------------------------------------------------------------------------------------
I do not recall at which priority in init.d this custom init script was
executed but I did not intentionally set any high priority.
Now after rebooting the connection with the router is lost. However, I
do know the MAC of the router (is in the label: Netgear_9b:7d:a6) and
the interface to which this MAC belongs, and the IP that this router
interface was supposed to have (192.168.1.1). So if I try to ping this
IP from a laptop connected with Ethernet (with IP 192.168.1.230) to the
router this is what happens:
------------------------------------------------------------------------------------------
No. Time Source Destination
Protocol Length Info
2 24.567792 192.168.1.230 192.168.1.1 ICMP
155 Echo (ping) request id=0x10eb, seq=1/256, ttl=64
3 24.576590 Netgear_9b:7d:a6 Broadcast ARP
60 Who has 192.168.1.230? Tell 192.168.1.1
4 24.576625 Sony_63:75:8e Netgear_9b:7d:a6 ARP
42 192.168.1.230 is at f0:bf:97:63:75:8e
5 25.576600 Netgear_9b:7d:a6 Broadcast ARP
60 Who has 192.168.1.230? Tell 192.168.1.1
6 25.576608 192.168.1.230 192.168.1.1 ICMP
155 Echo (ping) request id=0x10eb, seq=2/512, ttl=64
...
------------------------------------------------------------------------------------------
The laptop already has the MAC of the router in its ARP table, therefore
issues the PING. Then the router hears this PING, but his arp table is
empty and therefore sends an ARP request to find out to which MAC the
laptop's IP belongs to. Then the laptop sends a reply to this ARP
request, but the router ignores it and does not send the ICMP reply!
This is not only an ICMP problem, it also happens if I try to ssh or to
connect via the Web portal. Therefore, I have the feeling that the
problem is with the ARP process in the router.
Anyone has any idea of how to connect to the router? Would it be
possible to try to access using IPv6 (since there is no arp)? but I have
no experience with that. Otherwise is it possible to flash a new
firmware to the router without IP connectivity?
Best Regards
Daniel
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