| 1 |
On 10/18/2014 12:37 PM, Mick wrote: |
| 2 |
> On Saturday 18 Oct 2014 16:38:52 Alec Ten Harmsel wrote: |
| 3 |
>> On 10/18/2014 04:06 AM, Mick wrote: |
| 4 |
>>> What do the router logs say? |
| 5 |
>> DD-WRT is not very informative. It only has system-type stuff in |
| 6 |
>> /var/log/messages, nothing LAN-related. |
| 7 |
> As James suggested, if you have SSH or telnet access to the router run arp to |
| 8 |
> see what the arp tables include. Also ping the server from the router to see |
| 9 |
> if you get any responses. I expect that these will not reveal anything |
| 10 |
> untoward, but it is best to follow a process of elimination a step at a time. |
| 11 |
|
| 12 |
All fine here; pinging from router to server works, and the ARP table |
| 13 |
has entries for both desktop and server. |
| 14 |
|
| 15 |
> |
| 16 |
>>> Have you captured any packets on both ends and in between? |
| 17 |
>> Capturing packets on my desktop shows strange behavior. When I ping my |
| 18 |
>> server (kwopper), my desktop (greenbeast) starts generating a bunch of |
| 19 |
>> ARPs, none of which get answered. |
| 20 |
> Only to state the obvious, that this is not the expected behaviour. Are you |
| 21 |
> sure that the server firewall isn't configured to only allow connections from |
| 22 |
> your laptop and/or drop arp packets to avoid arp attacks? What happens when |
| 23 |
> you disable the firewall? |
| 24 |
|
| 25 |
Firewall is completely disabled on the server, as is SELinux. |
| 26 |
|
| 27 |
> |
| 28 |
>> When my laptop pings kwopper, the |
| 29 |
>> first ARP is answered instantly and the pings succeed. Pinging from |
| 30 |
>> kwopper is the same; instantly finds and connects to my laptop, but my |
| 31 |
>> desktop does not see any ARPs or ICMPs from kwopper. |
| 32 |
> Using arpscan and arping between desktop and server you should be able to find |
| 33 |
> out what is happening, but I suspect something to do with the server |
| 34 |
> configuration. |
| 35 |
> |
| 36 |
|
| 37 |
arpscanning the entire subnet results in 3 responses, with 2 being |
| 38 |
displayed and 1 being dropped by the kernel. arpping, even with -D and |
| 39 |
-U, returns nothing. |
| 40 |
|
| 41 |
I have no idea what's going on. I think what I'm gonna do is install my |
| 42 |
old router behind the new router and plug in all my device to that one |
| 43 |
and see if it works, because I absolutely need my desktop and server to |
| 44 |
be able to reach each other. |
| 45 |
|
| 46 |
Alec |
Archives