My point being with ARP you can't ping. Regardless if the ARP happens right after you issue the ping command or it learned the MAC from ARP hours ago, you still need ARP to do ping.
Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Thu, Aug 26, 2010 at 2:03 PM, Kristian Hoffmann <[email protected]> wrote: > Every time an IP packet is sent over an ethernet interface, the > destination MAC address needs to be resolved to either the MAC address > of the gateway or the destination IP on the same subnet. If an existing > (non-stale) ARP entry is in the ARP table, it will use the MAC address > from the cache. Otherwise the IP stack triggers an ARP request to > resolve the MAC address. > > So you're both right. ICMP, TCP, UDP, etc. don't use ARP, your IP stack > does. But you couldn't send any IP packets without ARP. > > Your picture just shows that there wasn't a non-stale ARP entry in the > cache, so it triggered an ARP request before it was able to send the > ICMP packet. > > Regards, > > -Kristian > > On Thu, 2010-08-26 at 13:43 -0400, Josh Luthman wrote: >> Well that's just not true. >> >> http://i.imgur.com/dti6U.png >> >> Josh Luthman >> Office: 937-552-2340 >> Direct: 937-552-2343 >> 1100 Wayne St >> Suite 1337 >> Troy, OH 45373 >> >> >> >> On Thu, Aug 26, 2010 at 1:23 PM, Jerry Richardson >> <[email protected]> wrote: >> > Ping is ARPless. >> > >> > But when you hit the interface of the router with a ping an ARP entry >> > is made and is good until it tiles out. >> > >> > For whatever reason ARP requests are not getting through. Either a >> > Linux box or a Win app than can send an ARP ping would be very useful. >> > >> > Jerry Richardson >> > Sent Mobile >> > >> > On Aug 26, 2010, at 9:43 AM, "Josh Luthman" >> > <[email protected]> wrote: >> > >> >> If it was an ARP issue then how does a ping work? >> >> >> >> Josh Luthman >> >> Office: 937-552-2340 >> >> Direct: 937-552-2343 >> >> 1100 Wayne St >> >> Suite 1337 >> >> Troy, OH 45373 >> >> >> >> >> >> >> >> On Thu, Aug 26, 2010 at 12:36 PM, Jerry Richardson >> >> <[email protected]> wrote: >> >>> I doubt it's DNS but you can test that. When they cannot connect >> >>> via URL have them try to access the site via IP. If they can access >> >>> it it's DNS, if they can't it's ARP. >> >>> >> >>> If it's not DNS, the next step is to log into your router when the >> >>> customer cannot connect and see if there is an ARP entry. I'm >> >>> betting it's timing out out an not refreshing until you ping the >> >>> gateway from the CPE (Ping is ARPless). >> >>> >> >>> Finding where/why the ARP request is dying is the tryicky part. >> >>> With the customer still unable to connect, log into the AP and ping >> >>> the CPE and then have the customer try to load the page. If that >> >>> works the issue is probably between the AP and CPE. If not, move to >> >>> the next device up the chain each time pinging the CPE until the >> >>> customer can connect. >> >>> >> >>> As a temporary measure you could add a static ARP entry in the >> >>> router but that's a bandaid and may mask a more serious problem. >> >>> >> >>> >> >>> - Jerry >> >>> >> >>> >> >>> -----Original Message----- >> >>> From: [email protected] [mailto:wireless- >> >>> [email protected]] On Behalf Of Mark Dueck >> >>> Sent: Thursday, August 26, 2010 8:15 AM >> >>> To: [email protected] >> >>> Subject: Re: [WISPA] no net but ping works >> >>> >> >>> I have about 25 clients on this AP. I think only 2 of them are >> >>> NS2's, >> >>> the rest are SL2's and they are all updated to 5.0.4 firmware, >> >>> which has >> >>> the fix for the limited connections that the 4.x firmware had. >> >>> >> >>> All the Tranzeo's have their RTS at 3000, their default. I checked >> >>> the >> >>> NS2's, but I can't find that setting in the webGUI. How do I >> >>> check/change that? >> >>> >> >>> On 08/26/2010 07:56 AM, Ryan Spott wrote: >> >>>> Hey Mark, >> >>>> >> >>>> How many CPE are attached to your AP? >> >>>> >> >>>> Have you adjusted RTS/CTS Settings? Take a look here: >> >>>> >> >>>> http://www.tranzeofaq.com/RTS-CTS.html >> >>>> >> >>>> ryan >> >>>> >> >>>> On Wed, Aug 25, 2010 at 9:09 PM, Mark Dueck <[email protected]> wrote: >> >>>> >> >>>>> I don't think it's a DNS because most clients that are >> >>>>> complaining are from >> >>>>> one AP. Today I got one that's from a diff AP that said their >> >>>>> net was >> >>>>> intermittent. >> >>>>> >> >>>>> I myself am browsing on the same network and never experience >> >>>>> that problem. >> >>>>> I have the same settings. >> >>>>> >> >>>>> Mostly Tranzeo SL2's as clients, with 2 PowerStations as AP's. >> >>>>> The rest of >> >>>>> the AP's are all Tranzeo. All clients are routed internally, but >> >>>>> after the >> >>>>> client radio everything is bridged. I rebooted the gateway to >> >>>>> clear the arp >> >>>>> cache, but clients are still experiencing the same problem. >> >>>>> >> >>>>> Could it cause a problem with the fact that the gateway is >> >>>>> multiwan and 2 of >> >>>>> it's wan's are on the same network as the clients, but different >> >>>>> subnet. I >> >>>>> know I need to VLAN, but had some issues with VLAN not connecting. >> >>>>> >> >>>>> >> >>>>> On 08/25/2010 05:51 PM, Josh Luthman wrote: >> >>>>> >> >>>>> What kind of radios? >> >>>>> >> >>>>> You sure it isn't a problem with the DNS servers? >> >>>>> >> >>>>> On Aug 25, 2010 7:44 PM, "Mark Dueck" <[email protected]> wrote: >> >>>>> >> >>>>> Hi, >> >>>>> >> >>>>> I've got some issues on my network with clients complaining they >> >>>>> have no >> >>>>> internet. When I come around, as soon as I ping gateway and then >> >>>>> google >> >>>>> dns, the browsing is back up. I showed a client how to do this, >> >>>>> and he >> >>>>> says whenever his internet goes down, as soon as he pings it's >> >>>>> right >> >>>>> back up. >> >>>>> >> >>>>> Anyone have ideas why this could happen? >> >>>>> >> >>>>> Thanks, >> >>>>> Mark >> >>>>> >> >>>>> >> >>>>> --- >> >>>>> --- >> >>>>> --- >> >>>>> --- >> >>>>> --- >> >>>>> ----------------------------------------------------------------- >> >>>>> WISPA Wants You! 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