Network issues. Packet loss when spray is used!!!!!!!!!!!!!!!
Hi, I am not in a position to figure out, is it an issue with my server or my network. I run spray and find packet loss...what should I suspect?
In one way, the packet loss is 0%, while the other way, there is 90% loss. Both machines are located in two different buildings.
here is the output.
bash-2.03# spray 172.16.59.7
sending 1162 packets of length 86 to 172.16.59.7 ...
no packets dropped by 172.16.59.7
34031 packets/sec, 2926694 bytes/sec
bash-2.03# spray 172.16.59.7
sending 1162 packets of length 86 to 172.16.59.7 ...
no packets dropped by 172.16.59.7
33512 packets/sec, 2882044 bytes/sec
bash-2.03# spray 172.16.59.238
sending 1162 packets of length 86 to 172.16.59.238 ...
205 packets (17.642%) dropped by 172.16.59.238
28146 packets/sec, 2420575 bytes/sec
bash-2.05$ spray giove
sending 1162 packets of length 86 to giove ...
1052 packets (90.534%) dropped by giove
7 packets/sec, 629 bytes/sec
bash-2.05$ spray giove
sending 1162 packets of length 86 to giove ...
1052 packets (90.534%) dropped by giove
7 packets/sec, 629 bytes/sec
bash-2.05$ spray giove
sending 1162 packets of length 86 to giove ...
1052 packets (90.534%) dropped by giove
7 packets/sec, 629 bytes/sec
bash-2.05$ spray giove
sending 1162 packets of length 86 to giove ...
1052 packets (90.534%) dropped by giove
7 packets/sec, 630 bytes/sec
bash-2.05$ spray giove
sending 1162 packets of length 86 to giove ...
1052 packets (90.534%) dropped by giove
7 packets/sec, 630 bytes/sec
bash-2.05$ spray giove
sending 1162 packets of length 86 to giove ...
1052 packets (90.534%) dropped by giove
7 packets/sec, 630 bytes/sec
http://docs.sun.com/app/docs/doc/816-5166/6mbb1kqhl?a=view
spray is not useful as a networking benchmark, as it uses unreliable connectionless transports, UDP for example. spray can report a large number of packets dropped when the drops were caused by spray sending packets faster than they can be buffered locally, that is, before the packets get to the network medium.
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Packet loss when pinging from/to a cisco 3560e switch
I see Packet loss when pinging from/to a cisco 3560e switch. CPU utilization is normal.
Switches are running with IOS c3560e-universalk9-mz.122-35.SE5.bin.
Packet loss is observed for all the devices irrespective of directly connected or remote devices.
If i do self pinging, there are no packet loss.
I don't see any error on interface.
Can anyone please help me in resolving this issue.TCB Local Address Foreign Address (state)
03737C48 10.47.0.229.60053 10.41.81.55.49 CLOSEWAIT
039ACDC4 10.47.0.229.61929 10.41.35.250.49 CLOSEWAIT
03B316C0 10.47.0.229.27544 10.41.81.55.49 CLOSEWAIT
038228F0 10.47.0.229.16506 10.41.35.250.49 CLOSEWAIT
039C3D04 10.47.0.229.15207 10.41.81.55.49 CLOSEWAIT
039A9BD0 10.47.0.229.52983 10.41.81.55.49 CLOSEWAIT
0394152C 10.47.0.229.22425 161.61.35.250.49 CLOSEWAIT
037D811C 10.47.0.229.21117 10.41.81.55.49 CLOSEWAIT
039C12BC 10.47.0.229.37437 10.41.81.55.49 CLOSEWAIT
03933B84 10.47.0.229.34085 161.61.35.250.49 TIMEWAIT
03B32340 10.47.0.229.45729 10.41.81.55.49 CLOSEWAIT
038247D0 10.47.0.229.32816 10.41.81.55.49 CLOSEWAIT
039A92D8 10.47.0.229.38680 161.61.35.250.49 CLOSEWAIT
037370F0 10.47.0.229.13212 10.41.81.55.49 CLOSEWAIT
037D85F0 10.47.0.229.38728 10.41.81.55.49 CLOSEWAIT
03B2B284 10.47.0.229.23428 10.41.81.55.49 CLOSEWAIT
03B2ADB0 10.47.0.229.56836 10.41.81.55.49 CLOSEWAIT
0394BFF0 10.47.0.229.23257 161.61.35.250.49 CLOSEWAIT
036604DC 10.47.0.229.44437 10.41.81.55.49 CLOSEWAIT
0394C700 10.47.0.229.22 192.37.184.211.61639 ESTAB
039B9A68 10.47.0.229.20543 10.41.81.55.49 CLOSEWAIT
03739B28 10.47.0.229.15392 10.41.81.55.49 CLOSEWAIT
TCB Local Address Foreign Address (state)
0392EA48 10.47.0.229.13862 10.41.81.55.49 CLOSEWAIT
0365E23C 10.47.0.229.27856 10.41.81.55.49 CLOSEWAIT
03817C0C 10.47.0.229.64929 10.41.81.55.49 CLOSEWAIT
039357C8 10.47.0.229.22088 10.41.81.55.49 CLOSEWAIT
037375C4 10.47.0.229.21832 10.41.81.55.49 CLOSEWAIT
039C20E8 10.47.0.229.18169 10.41.81.55.49 CLOSEWAIT
03716D08 10.47.0.229.61993 10.41.81.55.49 CLOSEWAIT
039A74E4 10.47.0.229.62948 10.41.81.55.49 CLOSEWAIT
03655480 10.47.0.229.14052 10.41.81.55.49 CLOSEWAIT
039407F0 10.47.0.229.49643 161.61.35.250.49 CLOSEWAIT
039A53AC 10.47.0.229.13233 10.41.81.55.49 CLOSEWAIT
03739FFC 10.47.0.229.16605 10.41.81.55.49 CLOSEWAIT
039B82B8 10.47.0.229.16458 10.41.35.250.49 CLOSEWAIT
039BEBA4 10.47.0.229.64377 10.41.81.55.49 CLOSEWAIT
03741980 10.47.0.229.13866 10.41.81.55.49 CLOSEWAIT
03B3ABF8 10.47.0.229.19365 10.41.81.55.49 CLOSEWAIT
039B5810 10.47.0.229.24768 10.41.81.55.49 CLOSEWAIT
03956E48 10.47.0.229.55980 161.61.35.250.49 CLOSEWAIT
03946820 10.47.0.229.65053 161.61.35.250.49 CLOSEWAIT
037DBE94 10.47.0.229.15283 10.41.81.55.49 CLOSEWAIT
039A4854 10.47.0.229.48562 10.41.81.55.49 CLOSEWAIT
TCB Local Address Foreign Address (state)
03B33320 10.47.0.229.29803 10.41.81.55.49 CLOSEWAIT
03B3B79C 10.47.0.229.12142 10.41.81.55.49 CLOSEWAIT
03713C9C 10.47.0.229.63799 10.41.81.55.49 CLOSEWAIT
039BBECC 10.47.0.229.14763 10.41.81.55.49 CLOSEWAIT
03656E40 10.47.0.229.16357 10.41.81.55.49 CLOSEWAIT
0362A73C 10.47.0.229.62450 10.41.81.55.49 CLOSEWAIT
039B878C 10.47.0.229.64402 161.61.35.250.49 CLOSEWAIT
03826CFC 10.47.0.229.16108 10.41.81.55.49 CLOSEWAIT
03B2CA34 10.47.0.229.17634 10.41.81.55.49 CLOSEWAIT
03AD78D0 10.47.0.229.15249 161.61.35.250.49 CLOSEWAIT
03AD967C 10.47.0.229.20389 161.61.35.250.49 CLOSEWAIT
03B2C560 10.47.0.229.37079 10.41.81.55.49 CLOSEWAIT
039C5128 10.47.0.229.24711 10.41.81.55.49 CLOSEWAIT
03822F74 10.47.0.229.54866 10.41.81.55.49 CLOSEWAIT
0372C5FC 10.47.0.229.13298 10.41.81.55.49 CLOSEWAIT
0372D278 10.47.0.229.12407 10.41.81.55.49 CLOSEWAIT
039A33D0 10.47.0.229.36573 10.41.81.55.49 CLOSEWAIT
039BCEF8 10.47.0.229.53853 10.41.81.55.49 CLOSEWAIT
039C02D8 10.47.0.229.53725 10.41.81.55.49 CLOSEWAIT
039B5CE4 10.47.0.229.58027 10.41.81.55.49 CLOSEWAIT
0381866C 10.47.0.229.17100 10.41.81.55.49 CLOSEWAIT
TCB Local Address Foreign Address (state)
039BB374 10.47.0.229.53148 10.41.81.55.49 CLOSEWAIT
03AD3634 10.47.0.229.19716 161.61.35.250.49 CLOSEWAIT
0362DAA4 10.47.0.229.19479 10.41.81.55.49 CLOSEWAIT
0365AE60 10.47.0.229.62209 10.41.81.55.49 CLOSEWAIT
0362D5D0 10.47.0.229.41327 10.41.81.55.49 CLOSEWAIT
037D7C48 10.47.0.229.58283 10.41.81.55.49 CLOSEWAIT
03955474 10.47.0.229.33810 161.61.35.250.49 CLOSEWAIT
0373B15C 10.47.0.229.23331 10.41.81.55.49 CLOSEWAIT
036628D0 10.47.0.229.46856 10.41.81.55.49 CLOSEWAIT
03819584 10.47.0.229.19861 10.41.81.55.49 CLOSEWAIT
0394D000 10.47.0.229.64732 10.41.35.250.49 CLOSEWAIT
0394B760 10.47.0.229.19967 161.61.35.250.49 CLOSEWAIT
039B6BD4 10.47.0.229.40096 10.41.81.55.49 CLOSEWAIT
03AD7150 10.47.0.229.65184 10.41.35.250.49 CLOSEWAIT
039BC3A0 10.47.0.229.64702 10.41.81.55.49 CLOSEWAIT
03B3A724 10.47.0.229.60399 10.41.81.55.49 CLOSEWAIT
037145E0 10.47.0.229.43951 10.41.81.55.49 CLOSEWAIT
03955EDC 10.47.0.229.29015 161.61.35.250.49 TIMEWAIT
0365FB34 10.47.0.229.13961 10.41.81.55.49 CLOSEWAIT
03828D54 10.47.0.229.12743 10.41.81.55.49 CLOSEWAIT
037DB40C 10.47.0.229.23708 10.41.81.55.49 CLOSEWAIT
TCB Local Address Foreign Address (state)
039AF814 10.47.0.229.15100 10.41.81.55.49 CLOSEWAIT
0392E344 10.47.0.229.23399 10.41.35.250.49 CLOSEWAIT
0393DC3C 10.47.0.229.15393 161.61.35.250.49 CLOSEWAIT
03AD85D0 10.47.0.229.40932 161.61.35.250.49 TIMEWAIT
039574CC 10.47.0.229.25935 10.41.35.250.49 CLOSEWAIT
03738B74 10.47.0.229.58656 10.41.81.55.49 CLOSEWAIT
039AD91C 10.47.0.229.56760 10.41.81.55.49 CLOSEWAIT
03B3BC70 10.47.0.229.15058 10.41.81.55.49 CLOSEWAIT
03B2DC54 10.47.0.229.51131 161.61.35.250.49 CLOSEWAIT
03B393F0 10.47.0.229.11957 10.41.35.250.49 CLOSEWAIT
039B2610 10.47.0.229.33728 10.41.81.55.49 CLOSEWAIT
03B311EC 10.47.0.229.18047 10.41.81.55.49 CLOSEWAIT
039A8E04 10.47.0.229.52022 161.61.35.250.49 CLOSEWAIT
0365D460 10.47.0.229.12241 10.41.81.55.49 CLOSEWAIT
03B33E78 10.47.0.229.47640 10.41.81.55.49 CLOSEWAIT
0372C128 10.47.0.229.60323 10.41.81.55.49 CLOSEWAIT
03661CD8 10.47.0.229.39923 10.41.81.55.49 CLOSEWAIT
0393C73C 10.47.0.229.41864 10.41.35.250.49 CLOSEWAIT
03829584 10.47.0.229.56673 161.61.35.55.49 CLOSEWAIT
0362AC10 10.47.0.229.31952 10.41.81.55.49 CLOSEWAIT
039BF078 10.47.0.229.22636 10.41.81.55.49 CLOSEWAIT
TCB Local Address Foreign Address (state)
0365CF8C 10.47.0.229.14476 10.41.81.55.49 CLOSEWAIT
039B443C 10.47.0.229.59226 10.41.81.55.49 CLOSEWAIT
0393E794 10.47.0.229.56282 10.41.35.250.49 CLOSEWAIT
03657740 10.47.0.229.25769 10.41.81.55.49 CLOSEWAIT
03B2F6E8 10.47.0.229.19328 10.41.81.55.49 CLOSEWAIT
0373AC88 10.47.0.229.25766 10.41.81.55.49 CLOSEWAIT
039B213C 10.47.0.229.28882 10.41.81.55.49 CLOSEWAIT
039C07AC 10.47.0.229.38201 10.41.81.55.49 CLOSEWAIT
03AD8DD0 10.47.0.229.23002 10.41.35.250.49 CLOSEWAIT
03739048 10.47.0.229.29572 10.41.35.250.49 CLOSEWAIT
039BA464 10.47.0.229.32273 10.41.81.55.49 CLOSEWAIT
03B31E6C 10.47.0.229.32521 10.41.81.55.49 CLOSEWAIT
0365EBE0 10.47.0.229.41319 10.41.81.55.49 CLOSEWAIT
03938804 10.47.0.229.62841 10.41.35.250.49 CLOSEWAIT
039A1AF8 10.47.0.229.12758 10.41.81.55.49 CLOSEWAIT
039B7DE4 10.47.0.229.20921 10.41.81.55.49 CLOSEWAIT
036549F8 10.47.0.229.51903 10.41.81.55.49 CLOSEWAIT
03714CC8 10.47.0.229.45145 10.41.81.55.49 CLOSEWAIT
037425F8 10.47.0.229.56492 10.41.81.55.49 CLOSEWAIT
03B39D74 10.47.0.229.18174 10.41.81.55.49 CLOSEWAIT -
White noise, sort of packet loss when talking with...
Hi,
For some unknown reason when I talk with one specific person the call doesn't exactly drop out it sort of cuts the audio and gives me white noise (sort of like when you get packet loss when transferring files or gaming), I have 0 idea why it does it. Does it the reverse as well, but only for me and this person. Everyone else thats in the call doesn't get effected and its frustrating me.When in a call goto call > Technical info. This will show you various info about the call connection (and a lot of useless info aswell). Amongst the info is packet loss, and relays (if relays = more than 0 you are not directly connected).
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Packet Loss When Extending Network?
Hi there, everyone.
I just purchased the Airport Extreme AC after upgrading to 802.11AC devices in the home. On its own, the Extreme AC performs flawlessly - consistent connections, max speed my ISP provides, no-lag, no studdering, no packet loss. I was dissapointed with the range of the device at the far ends of my home, so I set up my previous generation Airport Extreme to extend the network.
It extends the network fine, speeds are about half of what I get at the source, but the issue is that when it is part of the network, I experience packet loss, anywhere from 3% to 8%. I've tested this multiple times, unplugging, testing, replugging, testing. It happens both wirelessly and through ethernet. The issue is no question caused by the previous gen Airport extending the network.
Any help here would be great!
Setup:
- Motorla Surfboard SB6141
- WAN into Airport Extreme AC
- Previous generation Airport Extreme to extend the network, no special settings.
Don't be afraid to use techincal terminology to help me. I can follow and understand the majority of it, as I'm pretty into all of this.I'm not aware of anything that has changed in the 802.11ac version of the AirPort base stations that would induce the packet loss that you are seeing with an extended network over using an earlier generation. I am assuming, of course, that you are extending another Apple wireless router ... correct?
Typically I would recommend that you would review the placement of the extending base station to be sure that it is in the optimal spot to reproduce the signal with the greatest amount of bandwidth possible. (Ref: This AirPort User Tip) -
Packet loss when flood pinging a Mac
I had some trouble transferring large files between my iMac and my MBP the other day and so started a bit of investigation. Mistake really - here is what I found:
All mac targets are running up-to-date Leopard and use intel processors.
The home network has a linksys wireless router - all devices connected by copper.
flood ping tests with command 'sudo ping -f <target>:
from iMac to MBP shows 30% packet loss
from MBP tp iMac shows 33% packet loss
from iMac to windows laptop 0% packet loss
from iMac to linksys router 0% packet loss
from iMac to Freecom NAS box 0% packet loss
from MBP to windows laptop 0% packet loss
from MBP to linksys router 0% packet loss
from MBP to Freecom NAS box 0% packet loss
I took the macbook to work and picked targets on another site, several busy switch hops away.
from MBP to windows desktop 0% packet loss
from MBP to another iMac 26% packet loss
from MBP to mac mini 28% packet loss
from MBP to linux server 0% packet loss
from linux server to MBP 32% packet loss
The firewall is off on all the targets.
Seem clear enough - Mac machines can't handle high ping loads. It is no good telling me they don't have to. If they can answer a ping at all, they should be able to handle the load. It is a perfectly acceptable way of stress testing the link. File transfers are generally not an issue but now I want to know...
Why can't the macs handle the ping floods?
Is this indicative of any other weakness in the IP stack?
PeteI had a suspicion of packet loss on my internet connection but could not be certain it was the ISP at fault. The fact that I had been having trouble transferring large files between my machines led me to look for possible local problems.
Network fault finding should always examine the hardware first so I wanted to see if there was anything about the cabling or the router which might be causing packet loss.
Actually copying data about the network is a pretty poor way to test things because you have several additional layer of complexity that can colour the results.
When I had narrowed down the flood ping packet loss to the macs, I went hunting on the 'net. There were plenty of people who were reporting various kinds of packet loss. Enough of them that I wondered if there was something more to it. Some of them were talking about similar symptoms to mine. The respondents usually answered a question other than the one asked so I thought I would put up some tests and see if there was actually a problem anywhere.
Now I know it is a 'feature' rather than a fault, I can work around it.
Thanks anyway
Pete -
Three devices on network: 100% packet loss for my iMac.
I'm having intermittent bouts of 100% packet-loss pinging my router from my iMac, at the same time my iPod touch and neighbor's Windows laptop are surfing wirelessly from the same router.
Sometimes these bouts resolve spontaneously. Otherwise I need to shut down, wait, and restart my iMac to reconnect. The longer the shut down, the longer I can connect it seems.
The problem started a few days ago, after months of trouble-free performance with the same settings. The computer usually stayed up all the time. I hoped in vain today's OSX 10.5.4 and AirPort firmware updates would fix the problem ...
Post 10pm is the most common problem time, 'tho I'm not sure if that's a function of my iMac's uptime (wireless module is cooking?) or some electronic interference firing up near by. Maybe a virus?
Known potential sources of interference have been around for months/years: my old wireless 'phone is a 900MHz model, the next door neighbor's satellite antenna's been up for months. The dodgy power in this old building is hopefully offset by the APC UPS that powers my Mac.
Do I keep fiddling with the AirPort channels, or do I take my computer back to the shop for (another) warranty repair?
Greg./No, I'm not letting my neighbor steal my signal. He's subletting off me, and his access to my network (WPA2 encryption) is part of the "deal". He's a bit of a night-owl, and the late night download limit is pretty big, so it works fine all round.
I used his laptop's (and my iPod Touch's) uninterrupted access (while my iMac's floundering in packet-loss purgatory) as a way of "narrowing down" to the prime suspect: the iMac wireless module.
Greg./
ps sorry about the unnecessary alliteration; I had to substitute "purgatory" because the forum software censors "****" (aich, ee, ell, ell).
Message was edited by: gregreedee
Message was edited by: gregreedee -
Traceroute timeouts and lots of packet loss when a...
I host various site via the above, and since late last night and today, I am having connection timeout issues on all of them (but sites like bbc, bt etc are fine). I contacted them and performed a traceroute to my default site southee.co.uk which timed out. Below are the results:
traceroute to southee.co.uk (37.61.236.12), 64 hops max, 52 byte packets
1 bthomehub (192.168.1.254) 2.733 ms 2.414 ms 2.415 ms
2 esr5.manchester5.broadband.bt.net (217.47.67.144) 72.412 ms 29.705 ms 131.735 ms
3 217.47.67.13 (217.47.67.13) 31.390 ms 29.680 ms 103.936 ms
4 213.1.69.226 (213.1.69.226) 41.172 ms 32.700 ms 129.323 ms
5 31.55.165.103 (31.55.165.103) 30.791 ms 31.639 ms 130.306 ms
6 213.120.162.69 (213.120.162.69) 31.248 ms 59.138 ms 30.657 ms
7 31.55.165.109 (31.55.165.109) 32.159 ms 31.507 ms 31.513 ms
8 acc2-10gige-9-2-0.mr.21cn-ipp.bt.net (109.159.250.228) 31.499 ms 31.325 ms
acc2-10gige-0-2-0.mr.21cn-ipp.bt.net (109.159.250.194) 31.197 ms
9 core2-te0-12-0-1.ealing.ukcore.bt.net (109.159.250.147) 41.744 ms
core2-te0-13-0-0.ealing.ukcore.bt.net (109.159.250.139) 41.346 ms
core2-te0-5-0-1.ealing.ukcore.bt.net (109.159.250.145) 41.744 ms
10 peer1-xe3-3-1.telehouse.ukcore.bt.net (109.159.254.211) 39.527 ms
peer1-xe10-0-0.telehouse.ukcore.bt.net (109.159.254.122) 38.791 ms 38.910 ms
11 te2-3.sov-edge1.uk.timico.net (195.66.224.111) 54.032 ms 37.941 ms 38.642 ms
12 78-25-201-30.static.dsl.as8607.net (78.25.201.30) 45.830 ms 46.413 ms 42.448 ms
13 * * *
They then performed a traceroute from the server and got the following, again with timeouts and packet loss. See below:
1. 37.61.236.1 0.0% 10 0.5 0.7 0.4 2.9 0.8
2. ae0-2061.ndc-core1.uk.timico 0.0% 10 0.3 0.3 0.2 0.5 0.1
3. te2-3.sov-edge1.uk.timico.ne 0.0% 10 10.5 9.7 4.2 30.2 8.7
4. linx1.ukcore.bt.net 0.0% 10 4.1 4.3 4.1 5.9 0.6
5. host213-121-193-153.ukcore.b 0.0% 10 5.5 8.0 4.9 12.7 2.3
6. acc2-10GigE-4-3-1.mr.21cn-ip 0.0% 10 11.4 11.4 11.4 11.6 0.1
7. ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
8. 31.55.165.108 0.0% 10 12.1 12.1 11.8 12.4 0.2
9. 213.120.162.68 0.0% 10 12.0 12.1 12.0 12.3 0.1
10. ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
I've just spent a fustrating 15 minutes with Bt Support chat who just seemed want to pass me on to the BT Business team, so I thought I'd post here, for a more informed response.Hi Jane, Thanks for the reply. I have now purchased an AEBS(n) to try to overcome this problem. The Apple site says it is compatible with all versions of Airport card so I thought it would solve the problem. My new problem is to be found here: http://discussions.apple.com/thread.jspa?threadID=1087292&tstart=0
However to answer your questions, The OS is 10.4.10 and I have run every updater I can find for all Macs concerned. hope this helps. -
BT Infinity Connection Issue / Packet Loss / Not G...
Hi,
I am getting random packet loss. The problem is not consistant but re-occuiring i.e it happens every 15-20 mins.
The average packet loss lasts for maybe 15-20 seconds each time. Each case is different sometimes more servere and lasts longer.
Speed Test
Quiet Line Test
Outcome no noise.
Router Stats
1. Product name:
BT Home Hub
2. Serial number:
+068343+NQ41133140
3. Firmware version:
Software version 4.7.5.1.83.8.204.1.11 (Type A) Last updated 22/05/15
4. Board version:
BT Hub 5A
5. DSL uptime:
0 days, 08:25:14
6. Data rate:
14803 / 43545
7. Maximum data rate:
17564 / 43047
8. Noise margin:
5.8 / 6.4
9. Line attenuation:
23.2 / 17.6
10. Signal attenuation:
23.4 / 17.6
I notice it whilst playing. I have some evidence to show it happening.Bump...
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8.1 update network issues and loss of all files
continual loss of network connection after update to 8.1. restored 8.0 & everything worked just wonderfully. then on 2/11/14 my system automatically updated to 8.1 and now all of my personal files are gone. I looked in Windows old and there aren't any
files there and I tried to restore back to 2/8/14 (only date given) and it crashed. Can I get my files back and restore my computer back to before the 2/11 update to 8.1.
Thank you in advance, freaking out
RachaelLet me check you detail PC model and Windows 8 and 8.1 version that you are using. You should learn carefully during upgrade.
do you able to do system restore in safe mode? how many restore point you got?
If you cant go to Windows and try another restore point also failed, there is no other way rather than going back to Windows 8 by reinstalling OS.
But lets try above step to check
Also check this
http://www.eightforums.com/tutorials/27188-windows-8-1-preview-download-install.html -
Internet connection loss when not in use
Hi, earlier this week I picked up a Mac Mini G4 running Mac OS X 10.4.11. I have it plugged into the interwebs through it's Ethernet port. The cable runs straight into a DSL modem. The modem seems to be working fine. All lights are on as they're supposed to be. When the internet is in use, the computer browses the web just fine. When left alone for a bit, the computer loses it's connection to the internet. The connection is also lost when the computer is in use but the internet is not being used (tying in Word, fiddling with Garageband for a long time etc). In the system preferences, under network, the status of the Ethernet flashes between "Built in ethernet is currently active and has the IP address ..... You are connected to the internet via built-in-Ethernet." and "The cable for built in Ethernet is not connected." Halp!
I am having an identical problem. When I go to the network settings - choose built in Ethernet - then connect - it processes and connects using the PPPoE password settings. I can then surf on safari or firefox. If I log off either or put the computer to sleep, when I log back on all settings are lost and I have to go thru the whole process again. Vianet said not their problem. Belkin said not router problem as Internet lights are all active. But if I use the airport utility I get zero Internet. What can I do? Mac mini is from 2005. Also 10.4.11.
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Performance issue in select when subselect is used
We have a select statement that is using a where clause that has dates in. I've simplified the SQL below to demonstrate roughly what it does:
select * from user_activity
where starttime >= trunc(sysdate - 1) + 18/24
and starttime < trunc(sysdate) + 18/24
(this selects records from a table where a starttime field has values beween 6pm today and 6pm yesterday).
We are using this statement to create a materialized view which we refresh daily. Occasionally we have the need to refresh the data for a historic day, which means that we need to go in and change the where lines, e.g. to get data from 3 days ago instead of yesterday, the where clause becomes:
select * from user_activity
where starttime >= trunc(sysdate - 3) + 18/24
and starttime < trunc(sysdate - 2) + 18/24
Having to recreate the views like this is a nuisance, so we decided to be 'smart' and create a table with a setting in that we could use to control the number of days the view looks back. So if our table is called days_ago and field called days (with a single record, set to 1), we now have
select * from user_activity
where starttime >= trunc(sysdate - (select days from days_ago) + 18/24
and starttime < trunc(sysdate - ((select days from days_ago) + 1) + 18/24
The original SQL takes a few seconds to run. However the 'improved' version takes 25 minutes.
The days table only has 1 record in, selecting directly from it is instantaneous. Running the select on its own.
Does anything jump out as being daft in this approach? We cannot explain why the performance has suddenly dropped off for such a simple change.Hi,
Do you really need a view to do this?
Can't you define a bind varibale, and use it in your query:
VARIABLE days_ago NUMBER
EXEC :days_ago := 3;
SELECT ...
WHERE starttime >= TRUNC (SYSDATE - :days_ago') + (18 / 24)
AND starttime < TRUNC (SYSDATE - :days_ago') + (42 / 24) -- 42 = 24 + 18If you really must have a view, then it might be faster if you got the parameter from a SYS_CONTEXT variable, rather than from a table.
Unfortunately, SYS_CONTEXT always returns a string, so you have to be carefule encoding the number as a string when you set the variable, and decoding it when you use the variable:
WHERE starttime >= TRUNC (SYSDATE - TO_NUMBER ( SYS_CONTEXT ('MY_VIEW_NAMESPACE', 'DAYS_AGO'))) + (18 / 24)
AND starttime < TRUNC (SYSDATE - TO_NUMBER ( SYS_CONTEXT ('MY_VIEW_NAMESPACE', 'DAYS_AGO'))) + (42 / 24) -- 42 = 24 + 18For more about SYS_CONTEXT, look it up in the SQL language m,anual, and follow the links there:
http://docs.oracle.com/cd/B28359_01/server.111/b28286/functions172.htm#sthref2268
If performance is important enough, consider storing the "fiscal day" as a separate (indexed) column. Starting in Oracle 11.1, you can use a virtual column for this. In earleir versions, you'd have to use a trigger. By "fiscal day", I mean:
TRUNC (starttime + (6/24))If starttime is between 18:00:00 on December 28 and 17:59:59 on December 29, this will return 00:00:00 on December 29. You could use it in a query (or view) like this:
WHERE fiscal_day = TRUNC (SYSDATE) - 2 -
Quality loss when merging files using QT7
I used QT7 to merge two video files using the suggested method of selecting all of the second file and pasting into end of first file. Worked fine, but the new file is barely larger than the first. Am I losing quality? 25MB + 15MB = 26MB instead of 40MB
I used QT7 to merge two video files using the suggested method of selecting all of the second file and pasting into end of first file. Worked fine, but the new file is barely larger than the first. Am I losing quality? 25MB + 15MB = 26MB instead of 40MB
Did you "Save," "Save As...," or "Export" the "combined" data file? Were the source files previously trimmed "by reference" at any time? -
We had a system outage due to power problems a few days ago, and now our WLC is showing short term packet loss when monitoring it using SNMP. We also monitor it using ICMP, but that shows no packet loss. I looked at the interface statistics on the WLC and all of the switches in between and there are no errors to be seen. is there any way to troubleshoot this problem on the WLC? I am more familiar with IOS than the WLC CLI.
Thanks,
Dan.No, no wireless issues that we know of. I wouldn't rule it out so fast, as our monitoring system is working fine. All of the other devices it is monitoring have no packet loss. Yes it could be something with the network, but why is it only this one device doing this....
Other then enabling and disabling the snmp option, and checking the interface the only other thing I know of trying is restarting it.
Dan. -
Hi all,
I am having a strange issue with my macbookpro recently. Here is the situation.
I have the TP-LINK wireless router both at home and work. IP address of this unit is 192.168.3.1 at home.
Recently i noticed a very high level of packet loss (60-70%) from my macbook pro when i pinged the default GW wireless router. I first thought its a wireless issue and tried debuging the issue from that end. I used my brother's macbook and he wasnt having this packet loss when i pinged from his terminal.
I then very randomly connected to my remote VPN server and noticed that the packetloss has disappeared when the VPN is connected and ping a remote IP such as 8.8.8.8.
Now i have two terminals running, one with a normal ping to 8.8.8.8 which goes via VPN and has 0% packet loss. Another terminal running a ping via interface en1 outside of the VPN interface using "ping -S 192.168.3.102 192.168.3.1" and this terminal is showing the same 60% packet loss.
Also strangely, this issue is only noticed at home router and not at work. At work the normal connection without VPN works fine.
I am at loss for ideas what could be causing this issue all of the sudden when the same settings were fine for over a year.
Any ideas?
ThanksNo solutions yet... I doubt this is a hardware matter as the packet loss goes away almost instantly when i switch on the VPN or simply move to other networks... The strangest thing is the VPN connection that solves the packet loss.. One thinks if VPN is overlaying on en1 to make its connection, how come the packetloss ceases to exist once there is a peer2peer connecton active to the same interface with the packet loss issue. Very strange indeed.
I thought also this could only be a ICMP issue (ping protocol) however ever the browsing slows down when im normally connected to this network.
In some awkward way im happy someone else is reporting this as I thought this is a weird enough problem for no one to comment on for yearly 10 days...
Im going to run a tcpdump to see if there is anything strange moving abount on my interfaces whilst there is a packet loss... will inform if any interesting results appeared... -
High Packet Loss on Media Gateway and Mediation Server leg
Hello,
We have recently begun to receive SCOM alerts showing a high percentage of poor voice quality on calls that are being sent to voicemail. QoE Reports show an extremely high packet loss on the Media Gateway and Mediation Server leg of the call.
The SCOM alerts are similar to this:
Alert: Media quality alert for gateway and Mediation Server leg
Source: Microsoft.LS.2010.QoE.Metric.AudioQuality.GatewayMS
Path: MonServer01;10.1.1.1 - FESERVER01;10.1.1.1 - FESERVER01 Last modified by: System Last modified time: 9/13/2013 9:16:17 AM Alert description:
Following are the details for this media quality alert:
Media quality alert for: Gateway and Mediation Server leg "10.1.1.1 - FESERVER01"
Total calls = 51
Poor quality calls = 12
Poor quality call percentage (%) = 23.53
Following are the average values for call classification metrics:
Average network degradation = 0.08
Average jitter (ms) = 1.86
Average packet loss (%) = 3.71
Average round trip time (ms) = 0.00
Average concealed metric (%) = 16.33
Average stretched metric (%) = 0.57
Average compressed metric (%) = 0.92
These alerts did not seem to be popping up until we enabled Media Bypass and CAC. The call setup looks like this:
MEDIANT 3000 -> MEDIATION SERVER -> UM SERVER
We have had our networking team take a look at all legs of the network between subnets and they do not find any dropped packets.
Any ideas what might be causing this to happen ONLY on calls that are transferred to voicemail?
Thanks.
-John Boslooper
VWGoA Lync Administrator
John K. Boslooper Unified Communication EngineerPlease try to disable Media Bypass and CAC to check if still have the issue.
Try to enable Media Bypass and CAC one at a time to check which cause the packet loss.
Tyr to use Lync Logging Tool to collect trace file on Lync Mediation Server.
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
Hi Lisa,
I Turned off CAC and left Media Bypass on. I received 87% packet loss, although when listening to the voicemail, I heard no drops at all. Here are the stats:
Audio Stream (Caller -> Callee)
Codec: PCMA Sample rate: 8000
Packet utilization: 947
Avg. packet loss rate: 26.40 % Max. packet loss rate: 87.11 %
Avg. jitter: 1 ms Max. jitter: 3 ms
Burst duration: 5000 ms Burst gap duration: 8690 ms
Burst density: 100.00 % Burst gap density: 0.00 %
Avg. concealed samples ratio: 21.00 % Avg. stretched samples ratio: 0.00 %
Avg. compressed samples ratio: 0.00 %
Avg. network MOS: 1.91 Min. network MOS: 1.50
Avg. network MOS degradation: 1.81 Max. network MOS degradation: 2.23
NMOS degradation (jitter): 0.00 % NMOS degradation (packet loss): 99.00 %
Audio Stream (Callee -> Caller)
Codec: PCMA Sample rate: 8000
Audio FEC: False Bandwidth estimates: 0 Kbps
Packet utilization: 658
Avg. packet loss rate: 0.00 % Max. packet loss rate: 0.00 %
Avg. jitter: 0 ms Max. jitter: 0 ms
Avg. round trip: 0 ms Max. round trip: 0 ms
Then I turned on CAC and turned off Media Bypass. Left a message. 0% Packet Loss. Voicemail sounded perfect once again. Here are the stats:
Audio Stream (Callee -> Caller)
Codec: PCMA Sample rate: 8000
Audio FEC: False Bandwidth estimates: 0 Kbps
Packet utilization: 1066
Avg. packet loss rate: 0.00 % Max. packet loss rate: 0.00 %
Avg. jitter: 0 ms Max. jitter: 0 ms
Avg. round trip: 0 ms Max. round trip: 0 ms
Audio Stream (Caller -> Callee)
Codec: PCMA Sample rate: 8000
Packet utilization: 1866
Avg. packet loss rate: 0.00 % Max. packet loss rate: 0.00 %
Avg. jitter: 2 ms Max. jitter: 9 ms
Burst duration: 0 ms Burst gap duration: 36000 ms
Burst density: 0.00 % Burst gap density: 0.00 %
Avg. concealed samples ratio: 0.00 % Avg. stretched samples ratio: 1.00 %
Avg. compressed samples ratio: 4.00 %
Avg. network MOS: 3.58 Min. network MOS: 3.54
Avg. network MOS degradation: 0.15 Max. network MOS degradation: 0.18
NMOS degradation (jitter): 0.00 % NMOS degradation (packet loss): 0.00 %
The kicker is, with media bybass enabled, the call going to Voicemail (Exchange UM) is not a media bypass call. The Lync Mediation server is handling the call in both instances (Media Bypass ON or OFF).
I'm thinking it's a problem with the reporting feature since no visible/physical packet loss can be seen or heard. Our issue also lies with the fact that it's throwing of our call quality stats for the day because of the amount of "poor calls" going
to voicemail.
I would really love to figure this out. Any thoughts?
John K. Boslooper Unified Communication Engineer
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