Slow ping responses on LAN, but only in one directionasymmetric ping times but constant file xfer times?ping round trip time on WiFiTime Capsule giving high ping times for wirelessHigh ping everywhere except one PCOdd one-way ping issue that I can't wrap my head aroundWhy would ping give me fast rtt values, but take a long time for each response to come back?Wifi performance is slow only when there are multiple radios in one routerIntermittently high ping times to router via Wi-FiCan't get an nping response through an Alcatel modem - but can get pingDuplicate Ping Responses from single AD Domain Controller
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Slow ping responses on LAN, but only in one direction
asymmetric ping times but constant file xfer times?ping round trip time on WiFiTime Capsule giving high ping times for wirelessHigh ping everywhere except one PCOdd one-way ping issue that I can't wrap my head aroundWhy would ping give me fast rtt values, but take a long time for each response to come back?Wifi performance is slow only when there are multiple radios in one routerIntermittently high ping times to router via Wi-FiCan't get an nping response through an Alcatel modem - but can get pingDuplicate Ping Responses from single AD Domain Controller
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;
I've been investigating intermittently dropping RDP connections from my laptop and decided to ping another machine on the same subnet to see if there are any dropped packets or slow responses. The results I see are very confusing to me, so I wonder if someone can point me in the right direction for further investigation.
What I see is this:
If I ping machine X from my laptop, I get, on average, 300ms responses (which seems kinda slow for a very uncongested home network), but no packets are lost. Also the responses are all over the place, from 65ms to 1500ms. However, when I ping my laptop from machine X, the responses average about 3ms and don't vary very much. So that's 100 times faster from X to my laptop.
Here is my setup:
Dual-band wireless router, both machines are connected over WiFi, machine X is on 5GHz band, the laptop is on 2.4GHz band (unfortunately it doesn't support 5GHz). The same local subnet. Both machines are running Ubuntu. Both WiFi adapters report very strong signals.
Any ideas for what can account for such a vast difference in response times in just one direction and what can I check to investigate the issue further?
Thank you for your time and help.
networking wifi ping
asked May 30 '17 at 22:00
WorldOfConfusionWorldOfConfusion
11
add a comment |
I've been investigating intermittently dropping RDP connections from my laptop and decided to ping another machine on the same subnet to see if there are any dropped packets or slow responses. The results I see are very confusing to me, so I wonder if someone can point me in the right direction for further investigation.
What I see is this:
If I ping machine X from my laptop, I get, on average, 300ms responses (which seems kinda slow for a very uncongested home network), but no packets are lost. Also the responses are all over the place, from 65ms to 1500ms. However, when I ping my laptop from machine X, the responses average about 3ms and don't vary very much. So that's 100 times faster from X to my laptop.
Here is my setup:
Dual-band wireless router, both machines are connected over WiFi, machine X is on 5GHz band, the laptop is on 2.4GHz band (unfortunately it doesn't support 5GHz). The same local subnet. Both machines are running Ubuntu. Both WiFi adapters report very strong signals.
Any ideas for what can account for such a vast difference in response times in just one direction and what can I check to investigate the issue further?
Thank you for your time and help.
networking wifi ping
asked May 30 '17 at 22:00
WorldOfConfusionWorldOfConfusion
11
It may be caused by wi-fi, but confirming this requires special tools (at least, a wireless sniffer. Try to move the machines, bring them closer, etc. It may be caused by something on machine X not related to wireless, Try to connect them with a cable. Run performance monitor on X.
– ddbug
May 30 '17 at 23:20
Run a packet capture on machine X while you ping it from your laptop. How long does it take machine X to respond to the ping?
– joeqwerty
May 31 '17 at 0:45
Does changing power settings of either machines make a difference?
– Cameron Kerr
May 31 '17 at 6:14
add a comment |
I've been investigating intermittently dropping RDP connections from my laptop and decided to ping another machine on the same subnet to see if there are any dropped packets or slow responses. The results I see are very confusing to me, so I wonder if someone can point me in the right direction for further investigation.
What I see is this:
If I ping machine X from my laptop, I get, on average, 300ms responses (which seems kinda slow for a very uncongested home network), but no packets are lost. Also the responses are all over the place, from 65ms to 1500ms. However, when I ping my laptop from machine X, the responses average about 3ms and don't vary very much. So that's 100 times faster from X to my laptop.
Here is my setup:
Dual-band wireless router, both machines are connected over WiFi, machine X is on 5GHz band, the laptop is on 2.4GHz band (unfortunately it doesn't support 5GHz). The same local subnet. Both machines are running Ubuntu. Both WiFi adapters report very strong signals.
Any ideas for what can account for such a vast difference in response times in just one direction and what can I check to investigate the issue further?
Thank you for your time and help.
networking wifi ping
asked May 30 '17 at 22:00
WorldOfConfusionWorldOfConfusion
11
I've been investigating intermittently dropping RDP connections from my laptop and decided to ping another machine on the same subnet to see if there are any dropped packets or slow responses. The results I see are very confusing to me, so I wonder if someone can point me in the right direction for further investigation.
What I see is this:
If I ping machine X from my laptop, I get, on average, 300ms responses (which seems kinda slow for a very uncongested home network), but no packets are lost. Also the responses are all over the place, from 65ms to 1500ms. However, when I ping my laptop from machine X, the responses average about 3ms and don't vary very much. So that's 100 times faster from X to my laptop.
Here is my setup:
Dual-band wireless router, both machines are connected over WiFi, machine X is on 5GHz band, the laptop is on 2.4GHz band (unfortunately it doesn't support 5GHz). The same local subnet. Both machines are running Ubuntu. Both WiFi adapters report very strong signals.
Any ideas for what can account for such a vast difference in response times in just one direction and what can I check to investigate the issue further?
Thank you for your time and help.
networking wifi ping
networking wifi ping
asked May 30 '17 at 22:00
WorldOfConfusionWorldOfConfusion
11
asked May 30 '17 at 22:00
WorldOfConfusionWorldOfConfusion
11
edited May 31 '17 at 23:21
WorldOfConfusion
asked May 30 '17 at 22:00
WorldOfConfusionWorldOfConfusion
11
asked May 30 '17 at 22:00
WorldOfConfusionWorldOfConfusion
11
asked May 30 '17 at 22:00
WorldOfConfusionWorldOfConfusion
11
11
It may be caused by wi-fi, but confirming this requires special tools (at least, a wireless sniffer. Try to move the machines, bring them closer, etc. It may be caused by something on machine X not related to wireless, Try to connect them with a cable. Run performance monitor on X.
– ddbug
May 30 '17 at 23:20
Run a packet capture on machine X while you ping it from your laptop. How long does it take machine X to respond to the ping?
– joeqwerty
May 31 '17 at 0:45
Does changing power settings of either machines make a difference?
– Cameron Kerr
May 31 '17 at 6:14
add a comment |
It may be caused by wi-fi, but confirming this requires special tools (at least, a wireless sniffer. Try to move the machines, bring them closer, etc. It may be caused by something on machine X not related to wireless, Try to connect them with a cable. Run performance monitor on X.
– ddbug
May 30 '17 at 23:20
Run a packet capture on machine X while you ping it from your laptop. How long does it take machine X to respond to the ping?
– joeqwerty
May 31 '17 at 0:45
Does changing power settings of either machines make a difference?
– Cameron Kerr
May 31 '17 at 6:14
It may be caused by wi-fi, but confirming this requires special tools (at least, a wireless sniffer. Try to move the machines, bring them closer, etc. It may be caused by something on machine X not related to wireless, Try to connect them with a cable. Run performance monitor on X.
– ddbug
May 30 '17 at 23:20
It may be caused by wi-fi, but confirming this requires special tools (at least, a wireless sniffer. Try to move the machines, bring them closer, etc. It may be caused by something on machine X not related to wireless, Try to connect them with a cable. Run performance monitor on X.
– ddbug
May 30 '17 at 23:20
Run a packet capture on machine X while you ping it from your laptop. How long does it take machine X to respond to the ping?
– joeqwerty
May 31 '17 at 0:45
Run a packet capture on machine X while you ping it from your laptop. How long does it take machine X to respond to the ping?
– joeqwerty
May 31 '17 at 0:45
Does changing power settings of either machines make a difference?
– Cameron Kerr
May 31 '17 at 6:14
Does changing power settings of either machines make a difference?
– Cameron Kerr
May 31 '17 at 6:14
add a comment |
2 Answers
2
active
oldest
votes
If there is anything between server X and the router, it could be getting ratty data. In radio fundamentals, the lower the bandwidth, the better the signal can get through walls. That would explain why the 2.4GHz machine is getting a better response than the 5GHz machine.
answered Jun 1 '17 at 1:10
BBAVBBAV
11
Do you mean lower frequencies permeate walls better? You said bandwidth, but referenced frequencies.
– Cory Knutson
Jun 2 '17 at 18:51
Sorry, yes I meant frequency. I come from a radio background, and we refer to frequency groups as bands, so I got myself turned around.
– BBAV
Jun 2 '17 at 19:16
add a comment |
It looks like machine X might have 802.11 power saving enabled, so it enters lower power mode between pings and has to wake up each time you ping it. When going in the other direction, your laptop does not enter power saving mode, so it answers right away. This is taken from the answer here:
https://superuser.com/questions/716596/how-to-diagnose-long-asymmetric-ping-times-to-a-linux-host
You can prove this is the case by shortening the interval between pings until the pings come so rapidly that machine X does not enter low power mode:
sudo ping -i 0.1 x.x.x.x
answered May 18 at 19:34
expzexpz
1266
add a comment |
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2 Answers
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active
oldest
votes
2 Answers
2
active
oldest
votes
active
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votes
If there is anything between server X and the router, it could be getting ratty data. In radio fundamentals, the lower the bandwidth, the better the signal can get through walls. That would explain why the 2.4GHz machine is getting a better response than the 5GHz machine.
answered Jun 1 '17 at 1:10
BBAVBBAV
11
Do you mean lower frequencies permeate walls better? You said bandwidth, but referenced frequencies.
– Cory Knutson
Jun 2 '17 at 18:51
Sorry, yes I meant frequency. I come from a radio background, and we refer to frequency groups as bands, so I got myself turned around.
– BBAV
Jun 2 '17 at 19:16
add a comment |
If there is anything between server X and the router, it could be getting ratty data. In radio fundamentals, the lower the bandwidth, the better the signal can get through walls. That would explain why the 2.4GHz machine is getting a better response than the 5GHz machine.
answered Jun 1 '17 at 1:10
BBAVBBAV
11
Do you mean lower frequencies permeate walls better? You said bandwidth, but referenced frequencies.
– Cory Knutson
Jun 2 '17 at 18:51
Sorry, yes I meant frequency. I come from a radio background, and we refer to frequency groups as bands, so I got myself turned around.
– BBAV
Jun 2 '17 at 19:16
add a comment |
If there is anything between server X and the router, it could be getting ratty data. In radio fundamentals, the lower the bandwidth, the better the signal can get through walls. That would explain why the 2.4GHz machine is getting a better response than the 5GHz machine.
answered Jun 1 '17 at 1:10
BBAVBBAV
11
If there is anything between server X and the router, it could be getting ratty data. In radio fundamentals, the lower the bandwidth, the better the signal can get through walls. That would explain why the 2.4GHz machine is getting a better response than the 5GHz machine.
answered Jun 1 '17 at 1:10
BBAVBBAV
11
answered Jun 1 '17 at 1:10
BBAVBBAV
11
answered Jun 1 '17 at 1:10
BBAVBBAV
11
answered Jun 1 '17 at 1:10
BBAVBBAV
11
11
Do you mean lower frequencies permeate walls better? You said bandwidth, but referenced frequencies.
– Cory Knutson
Jun 2 '17 at 18:51
Sorry, yes I meant frequency. I come from a radio background, and we refer to frequency groups as bands, so I got myself turned around.
– BBAV
Jun 2 '17 at 19:16
add a comment |
Do you mean lower frequencies permeate walls better? You said bandwidth, but referenced frequencies.
– Cory Knutson
Jun 2 '17 at 18:51
Sorry, yes I meant frequency. I come from a radio background, and we refer to frequency groups as bands, so I got myself turned around.
– BBAV
Jun 2 '17 at 19:16
Do you mean lower frequencies permeate walls better? You said bandwidth, but referenced frequencies.
– Cory Knutson
Jun 2 '17 at 18:51
Do you mean lower frequencies permeate walls better? You said bandwidth, but referenced frequencies.
– Cory Knutson
Jun 2 '17 at 18:51
Sorry, yes I meant frequency. I come from a radio background, and we refer to frequency groups as bands, so I got myself turned around.
– BBAV
Jun 2 '17 at 19:16
Sorry, yes I meant frequency. I come from a radio background, and we refer to frequency groups as bands, so I got myself turned around.
– BBAV
Jun 2 '17 at 19:16
add a comment |
It looks like machine X might have 802.11 power saving enabled, so it enters lower power mode between pings and has to wake up each time you ping it. When going in the other direction, your laptop does not enter power saving mode, so it answers right away. This is taken from the answer here:
https://superuser.com/questions/716596/how-to-diagnose-long-asymmetric-ping-times-to-a-linux-host
You can prove this is the case by shortening the interval between pings until the pings come so rapidly that machine X does not enter low power mode:
sudo ping -i 0.1 x.x.x.x
answered May 18 at 19:34
expzexpz
1266
add a comment |
It looks like machine X might have 802.11 power saving enabled, so it enters lower power mode between pings and has to wake up each time you ping it. When going in the other direction, your laptop does not enter power saving mode, so it answers right away. This is taken from the answer here:
https://superuser.com/questions/716596/how-to-diagnose-long-asymmetric-ping-times-to-a-linux-host
You can prove this is the case by shortening the interval between pings until the pings come so rapidly that machine X does not enter low power mode:
sudo ping -i 0.1 x.x.x.x
answered May 18 at 19:34
expzexpz
1266
add a comment |
It looks like machine X might have 802.11 power saving enabled, so it enters lower power mode between pings and has to wake up each time you ping it. When going in the other direction, your laptop does not enter power saving mode, so it answers right away. This is taken from the answer here:
https://superuser.com/questions/716596/how-to-diagnose-long-asymmetric-ping-times-to-a-linux-host
You can prove this is the case by shortening the interval between pings until the pings come so rapidly that machine X does not enter low power mode:
sudo ping -i 0.1 x.x.x.x
answered May 18 at 19:34
expzexpz
1266
It looks like machine X might have 802.11 power saving enabled, so it enters lower power mode between pings and has to wake up each time you ping it. When going in the other direction, your laptop does not enter power saving mode, so it answers right away. This is taken from the answer here:
https://superuser.com/questions/716596/how-to-diagnose-long-asymmetric-ping-times-to-a-linux-host
You can prove this is the case by shortening the interval between pings until the pings come so rapidly that machine X does not enter low power mode:
sudo ping -i 0.1 x.x.x.x
answered May 18 at 19:34
expzexpz
1266
answered May 18 at 19:34
expzexpz
1266
answered May 18 at 19:34
expzexpz
1266
answered May 18 at 19:34
expzexpz
1266
1266
add a comment |
add a comment |
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It may be caused by wi-fi, but confirming this requires special tools (at least, a wireless sniffer. Try to move the machines, bring them closer, etc. It may be caused by something on machine X not related to wireless, Try to connect them with a cable. Run performance monitor on X.
– ddbug
May 30 '17 at 23:20
Run a packet capture on machine X while you ping it from your laptop. How long does it take machine X to respond to the ping?
– joeqwerty
May 31 '17 at 0:45
Does changing power settings of either machines make a difference?
– Cameron Kerr
May 31 '17 at 6:14