What happens if you ping from the linux box to the linux box's default gateway? If the problem doesn't exhibit in this test nor in any test between machines in your LAN, the problem is probably your providers: the DSL modem or something 'downstream' from it. You should consider doing tests #2 and #3 anyway as support for your position when you call your ISP to open a trouble ticket.
It's not an ISP. Now it's morning and only 5 users online. The ping is flawless... Well almost :) Hostname Last 50 pings 1. adsl-213-190-40-129.taka ..........>....................................... 2. fe22-acc0-tai.kns.teleco ..........c...................................... 3. telecom-gw.is.lt ..........b...................................... 4. litnet-gw.is.lt .........3a...................................... 5. cat6506-p2-1.kttc.litnet .........b3...1a................................. 6. ktu-lan.litnet.lt .........c..........................1............ 7. diz.ktu.lt .........>......1................................
Scale: .:30 ms 1:46 ms 2:62 ms 3:99 ms a:193 ms b:283 ms c:441 ms
2. plug a PC, configured as the linux router's eth0:1 interface (with proper default gateway) and ping from the pc to the default gateway. If the problem goes away, its probably the linux router (hardware or software).The problem goes away. I tried it here on my winxp box.
* security note *
Running both your LAN and the internet provider subnets on the same ethernet network puts you at a much greater security risk. You should seriously consider installing a third network interface into your linux box and moving eth0:1's ip info to eth2. Then plug the DSL modem into eth2 with a cross-over cable with no computers attached.
Huh, would be great, but there is one but. Modem is at one house and server is at another :) It's zyxel, maybe he has allow by mac or sth. I will look at his firmware setup. Or maybe you have some thoughts how to connect server and modem? (about 200 m) :)
I'm guessing your thirty users using Windows. If they have windows network enabled, they are all generating broadcast traffic. That traffic will most likely be crossing the DSL modem (since it is bridging). Aside from security implications, the local traffic that does get bridged is tying up your DSL bandwidth. It seems unlikely that 30 PC's could saturate your 128kbps uplink, but I'm no expert on windows networking. 128kbps is not a huge pipe, so perhaps it's possible. If so, the solution to your security problem is also the solution to the latency variability issue. If this is the case, both tests #2 and #3 will not show the variability, since your local LAN is effectively removed from the test.
Yes, this may be true and solution. But is C class subnet traffic routed? I think it isn't. It seems that when many users is browsing or doing normal day activities such as email checking and irc download/upload? is saturated and it causes ping jumps. I will try to move ACKs into front of queue and also prioritize some traffic. Bad that tc syntax is so unreadable.. Once it took 4 days for me to write tc script ;-)
Also as roy mentioned, there is no such ip: 81.7.84.1 But if i set nexthop as my gw it says net unreachable... Maybe that gw has multiple addresses or some magic is done on ISP side.
-- Sincerely, ArtÅras Ålajus ICQ: 157929934 Jabber: arturaz@xxxxxx
Oh, and please'o'please use UTF-8! :-)
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