Got a problem that i've had for some time, asked many people and no one seems to be able to figure it out... so heres a go at the wireless gurus...
@@@ PROBLEM @@@
-Lots of packet loss to AP, works fine for 50+ pings, then looses 10-30, then fine again
[client a] -- [ap] -- [client b]
[client a] can ping [client b] with no problems, even though this goes via the ap (the 2 clients can't see eachother because of a large hill between, thats the reason for the [ap].
@@@ TROUBLE SHOOTING @@@
pings to ap
--- ap ping statistics ---
100 packets transmitted, 98 packets received, 2% packet loss
round-trip min/avg/max = 4.5/5.9/14.0 ms
--- ap ping statistics ---
1050 packets transmitted, 397 packets received, 62% packet loss
round-trip min/avg/max = 4.5/6.2/16.2 ms
--- ap ping statistics ---
342 packets transmitted, 211 packets received, 38% packet loss
round-trip min/avg/max = 4.5/5.9/16.3 ms
pings to clientb from client a are consistent with hardly any loss.
--- clientb ping statistics ---
282 packets transmitted, 277 packets received, 1% packet loss
round-trip min/avg/max = 4.5/9.1/19.2 ms
As shown in this tcpdump, we have lots of icmp echo requests, but no replys, as soon as we get the arp, everything works fine. This seems to be the case every time when i loose pings for 20-30 packets, when it adds the arp, things come right.
I have added a static arp to the ap, however this didn't help the situation.
On the client a, I have tried adding a static arp, however was not 100% sure on how to do this so tried every way possible, some stopped traffic completely, the rest the problem remained.
nad:~# arp -a
hiv.nad-node.albanywireless.co.nz (10.23.19.180) at 00:50:FC:F2:94:3E [ether] on wlan1
ap (210.55.xx.xx) at 00:60:1D:F7:0A:41 [ether] on wlan0
? (10.23.15.4) at 00:02:6F:08:26:A4 [ether] on wlan0
? (10.23.15.2) at 00:02:6F:08:36:9C [ether] on wlan0
hallo, i am new here. i'm using SL-2511bg plus, and now i have problem, i can't connect my pc with it. i try to ping, and its timeout, the led indicator in my pc LANcard(RG45) are not showing that it is connected. in senao SL-2511 power led is good, but the line 1 or line2 led is off. i have check the cable and replace it with the new cable or rg45 connector, but it is the same. i thing the LAN ic inside senao sl-2511 (KENDIN ks8995) is not work. any one can help tell me how to fix it?
hallo, i am new here. i'm using SL-2511bg plus, and now i have problem, i can't connect my pc with it. i try to ping, and its timeout, the led indicator in my pc LANcard(RG45) are not showing that it is connected. in senao SL-2511 power led is good, but the line 1 or line2 led is off. i have check the cable and replace it with the new cable or rg45 connector, but it is the same. i think the LAN ic inside senao sl-2511 (KENDIN ks8995) is not work. any one can help tell me how to fix it?
hallo, :cry: i use senao SL-2511bg1plus to, and i have same problem with yusi, i access and ping this unit, i have already replace new cable an connector to, and the "kendin ks8995" and "sq-h44w" is verry hot when we touch it, i thing
this ic was broke,.. the led in my pc's LAN card is off to, and the power's led in senao unit is on, but the line1 led is of when we plug in the LAN connector, but when i connect the line2- the led in line2 is on, and i thing it is work, but the line2 is ony for out.. we can't transfer data with it.
any help?
many thanks for help..
Excuse me, but the way you are putting it, it sounds like you are trying to tell me that one computer has a WIRED lan card and the other a WIRELESS lan card.. is this true?? both computers must have either wireless or wired, not one of each. wired relies on cables and is not able to work with a wireless card on the other end...
Also, i have a Senao SL-2511EXT2+, which was hopeless under windows, so i use linux, and those ICs do get hot, its normal...
Have you got an AP?? you will need to put them in Ad-Hoc mode if you don't, and make sure the ESSIDs match, if they dont, then no connect (this is assuming you have wireless cards)
ok first of all to icepick
- Try making the ap on the hill a repeater and set one of the machines up as a ap
now for yusi
- ok if you think the Lan side of things in your ap are broken then send it back for a replacement to whoever you got it from.
But first make shure:
+That the fault isnt the network cable
+The lan card in the computer is not bung
+That you have the drivers for the lan card installed
+That you have power to the ap
+That you have protocols installed in the computer for the network
and for the last person.
-this also applys for yusi try finding a reset button on your routers and pressing it but only after trying every thing else.
-check your cable is in the femail socket properly.
It would help if you supplied a list of things that you have checked in trying to solve the proble.
hallo.. i'am relly sorry about "sorts of different problems"
and many many thanks for try to help.
+the LAN cable was good.(i have try to connect with another 2511/senao) and it is work. <i have two unit. one for AP in my home and the other was client,in my office>
+the LAN card good to, it can connect with another computer in the other room(the lan driver too)
+the power led on AP was on.
+i have try to check the female connector with multitester(ohm terster) and it is ok.
i buy the sl-2511 bg plus by shipping it from singapore.
what can i do?
many thankz for help.. :?
If you think its the AP that has died then send it back. I suggest that you get incontact with your supplier(who you bought it off) and then either get them to replace the current model or change to a different model.
I try to stay local with my suppliers (The country that I live in), that way their is less hastel if something goes wrong with the product.
weird arp problem 
Linear Mode
