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#1 2015-09-16 18:50:14

tomass
Member
From: Odolena Voda, Czech Republic
Registered: 2014-02-11
Posts: 9
Website

Loosing connection

Hi,

I have a problem that I do not know how to solve it.

Here is what happens:

1. boot
2. ping www.google.com => ok
3. ip link show net0 => ok
4. pacman -Syyu
   - after some data are downloaded connection stop working so I hit Ctrl+C
5. ip link show net0 => ok
6. ping www.google.com => nothing happens

To make connection working again I have to do

ip link set net0 down && ip link set net0 up

I have a dual boot on this machine and the other OS is just fine. So I do not think it is related to HW.

Regards,
Tomas

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#2 2015-09-16 23:07:00

fukawi2
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From: .vic.au
Registered: 2007-09-28
Posts: 6,231
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Re: Loosing connection

Compare the output of the following commands before and after step 4:

ip a s
ip r s
cat /etc/resolv.conf

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#3 2015-09-17 05:33:09

tomass
Member
From: Odolena Voda, Czech Republic
Registered: 2014-02-11
Posts: 9
Website

Re: Loosing connection

Before

# ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: net0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether e8:40:f2:eb:bb:55 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.104/24 brd 192.168.1.255 scope global net0
       valid_lft forever preferred_lft forever
    inet6 fe80::a93d:896c:ca75:1436/64 scope link 
       valid_lft forever preferred_lft forever
# ip r s
default via 192.168.1.1 dev net0  metric 202 
192.168.1.0/24 dev net0  proto kernel  scope link  src 192.168.1.104  metric 202 
# cat /etc/resolv.conf
# Generated by resolvconf
nameserver 192.168.1.1

After

# ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: net0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether e8:40:f2:eb:bb:55 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.104/24 brd 192.168.1.255 scope global net0
       valid_lft forever preferred_lft forever
    inet6 fe80::a93d:896c:ca75:1436/64 scope link 
       valid_lft forever preferred_lft forever
# ip r s
default via 192.168.1.1 dev net0  metric 202 
192.168.1.0/24 dev net0  proto kernel  scope link  src 192.168.1.104  metric 202 
# cat /etc/resolv.conf
# Generated by resolvconf
nameserver 192.168.1.1

I do not see any difference. Could it be something with configuration?

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#4 2015-09-17 05:39:58

fukawi2
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From: .vic.au
Registered: 2007-09-28
Posts: 6,231
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Re: Loosing connection

OK, so that's all good.

tomass wrote:

6. ping www.google.com => nothing happens

Can you elaborate on what "nothing happens" means? Something has to happen (terminal hangs, return to prompt with no output, error msg, etc?)

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#5 2015-09-17 06:13:28

tomass
Member
From: Odolena Voda, Czech Republic
Registered: 2014-02-11
Posts: 9
Website

Re: Loosing connection

After some time it returns:

ping: unknown host www.google.com

But when I use IP address instead I get 

From 192.168.1.104 icmp_seq=1 Destination Host Unreachable

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#6 2015-09-17 22:59:00

fukawi2
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From: .vic.au
Registered: 2007-09-28
Posts: 6,231
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Re: Loosing connection

This seems very similar to this issue from only a few days ago.

While it's broken, run this command and `ping 8.8.8.8`:

tcpdump -lnn -i net0 arp or host 192.168.1.1 or host 8.8.8.8

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#7 2015-09-18 05:23:44

tomass
Member
From: Odolena Voda, Czech Republic
Registered: 2014-02-11
Posts: 9
Website

Re: Loosing connection

Here is the output. It seems like my router suddenly becomes unreachable. But from other devices it is accessible.

07:17:43.230231 IP 192.168.1.1.2052 > 255.255.255.255.7437: UDP, length 173
07:17:46.236281 IP 192.168.1.1.2052 > 255.255.255.255.7437: UDP, length 173
07:17:47.948967 ARP, Request who-has 192.168.1.1 tell 192.168.1.105, length 28
07:17:47.949350 ARP, Reply 192.168.1.1 is-at f8:d1:11:56:7f:4a, length 46
07:17:47.949361 IP 192.168.1.105.49964 > 192.168.1.1.53: 26263+ A? mirror.vpsfree.cz. (35)
07:17:47.949364 IP 192.168.1.105.49964 > 192.168.1.1.53: 59475+ AAAA? mirror.vpsfree.cz. (35)
07:17:47.950588 IP 192.168.1.1.53 > 192.168.1.105.49964: 26263 1/0/0 A 77.93.223.10 (51)
07:17:47.951125 IP 192.168.1.1.53 > 192.168.1.105.49964: 59475 1/0/0 AAAA 2a03:3b40:1::42 (63)
07:17:49.242812 IP 192.168.1.1.2052 > 255.255.255.255.7437: UDP, length 173
07:18:04.444757 IP 192.168.1.105.51557 > 192.168.1.1.53: 22700+ A? archlinux.mirror.dkm.cz. (41)
07:18:04.444763 IP 192.168.1.105.51557 > 192.168.1.1.53: 24179+ AAAA? archlinux.mirror.dkm.cz. (41)
07:18:09.449823 IP 192.168.1.105.51557 > 192.168.1.1.53: 22700+ A? archlinux.mirror.dkm.cz. (41)
07:18:09.449831 IP 192.168.1.105.51557 > 192.168.1.1.53: 24179+ AAAA? archlinux.mirror.dkm.cz. (41)
07:18:14.454932 IP 192.168.1.105.47258 > 192.168.1.1.53: 29196+ A? archlinux.mirror.dkm.cz. (41)
07:18:14.454938 IP 192.168.1.105.47258 > 192.168.1.1.53: 30398+ AAAA? archlinux.mirror.dkm.cz. (41)
07:18:14.964659 IP 192.168.1.105.55236 > 192.168.1.1.53: 46151+ A? mirror.us.leaseweb.net. (40)
07:18:14.964666 IP 192.168.1.105.55236 > 192.168.1.1.53: 60068+ AAAA? mirror.us.leaseweb.net. (40)
07:18:19.460003 IP 192.168.1.105.47258 > 192.168.1.1.53: 29196+ A? archlinux.mirror.dkm.cz. (41)
07:18:19.460011 IP 192.168.1.105.47258 > 192.168.1.1.53: 30398+ AAAA? archlinux.mirror.dkm.cz. (41)
07:18:19.969704 IP 192.168.1.105.55236 > 192.168.1.1.53: 46151+ A? mirror.us.leaseweb.net. (40)
07:18:19.969711 IP 192.168.1.105.55236 > 192.168.1.1.53: 60068+ AAAA? mirror.us.leaseweb.net. (40)
07:18:24.974776 IP 192.168.1.105.34645 > 192.168.1.1.53: 9865+ A? mirror.us.leaseweb.net. (40)
07:18:24.974783 IP 192.168.1.105.34645 > 192.168.1.1.53: 38534+ AAAA? mirror.us.leaseweb.net. (40)
07:18:25.484524 IP 192.168.1.105.51742 > 192.168.1.1.53: 62153+ A? mirror.nl.leaseweb.net. (40)
07:18:25.484530 IP 192.168.1.105.51742 > 192.168.1.1.53: 56488+ AAAA? mirror.nl.leaseweb.net. (40)
07:18:29.979849 IP 192.168.1.105.34645 > 192.168.1.1.53: 9865+ A? mirror.us.leaseweb.net. (40)
07:18:29.979857 IP 192.168.1.105.34645 > 192.168.1.1.53: 38534+ AAAA? mirror.us.leaseweb.net. (40)
07:18:29.980770 ARP, Request who-has 192.168.1.1 tell 192.168.1.105, length 28
07:18:30.489591 IP 192.168.1.105.51742 > 192.168.1.1.53: 62153+ A? mirror.nl.leaseweb.net. (40)
07:18:30.489598 IP 192.168.1.105.51742 > 192.168.1.1.53: 56488+ AAAA? mirror.nl.leaseweb.net. (40)
07:18:30.984128 ARP, Request who-has 192.168.1.1 tell 192.168.1.105, length 28
07:18:31.987470 ARP, Request who-has 192.168.1.1 tell 192.168.1.105, length 28
07:18:35.494697 ARP, Request who-has 192.168.1.1 tell 192.168.1.105, length 28
07:18:36.497470 ARP, Request who-has 192.168.1.1 tell 192.168.1.105, length 28
...

Last edited by tomass (2015-09-18 05:27:33)

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#8 2015-09-18 06:47:39

fukawi2
Ex-Administratorino
From: .vic.au
Registered: 2007-09-28
Posts: 6,231
Website

Re: Loosing connection

07:18:04.444757 IP 192.168.1.105.51557 > 192.168.1.1.53: 22700+ A? archlinux.mirror.dkm.cz. (41)
07:18:04.444763 IP 192.168.1.105.51557 > 192.168.1.1.53: 24179+ AAAA? archlinux.mirror.dkm.cz. (41)
07:18:09.449823 IP 192.168.1.105.51557 > 192.168.1.1.53: 22700+ A? archlinux.mirror.dkm.cz. (41)
07:18:09.449831 IP 192.168.1.105.51557 > 192.168.1.1.53: 24179+ AAAA? archlinux.mirror.dkm.cz. (41)
07:18:14.454932 IP 192.168.1.105.47258 > 192.168.1.1.53: 29196+ A? archlinux.mirror.dkm.cz. (41)
07:18:14.454938 IP 192.168.1.105.47258 > 192.168.1.1.53: 30398+ AAAA? archlinux.mirror.dkm.cz. (41)
07:18:14.964659 IP 192.168.1.105.55236 > 192.168.1.1.53: 46151+ A? mirror.us.leaseweb.net. (40)
07:18:14.964666 IP 192.168.1.105.55236 > 192.168.1.1.53: 60068+ AAAA? mirror.us.leaseweb.net. (40)
07:18:19.460003 IP 192.168.1.105.47258 > 192.168.1.1.53: 29196+ A? archlinux.mirror.dkm.cz. (41)
07:18:19.460011 IP 192.168.1.105.47258 > 192.168.1.1.53: 30398+ AAAA? archlinux.mirror.dkm.cz. (41)
07:18:19.969704 IP 192.168.1.105.55236 > 192.168.1.1.53: 46151+ A? mirror.us.leaseweb.net. (40)
07:18:19.969711 IP 192.168.1.105.55236 > 192.168.1.1.53: 60068+ AAAA? mirror.us.leaseweb.net. (40)
07:18:24.974776 IP 192.168.1.105.34645 > 192.168.1.1.53: 9865+ A? mirror.us.leaseweb.net. (40)
07:18:24.974783 IP 192.168.1.105.34645 > 192.168.1.1.53: 38534+ AAAA? mirror.us.leaseweb.net. (40)
07:18:25.484524 IP 192.168.1.105.51742 > 192.168.1.1.53: 62153+ A? mirror.nl.leaseweb.net. (40)
07:18:25.484530 IP 192.168.1.105.51742 > 192.168.1.1.53: 56488+ AAAA? mirror.nl.leaseweb.net. (40)
07:18:29.979849 IP 192.168.1.105.34645 > 192.168.1.1.53: 9865+ A? mirror.us.leaseweb.net. (40)
07:18:29.979857 IP 192.168.1.105.34645 > 192.168.1.1.53: 38534+ AAAA? mirror.us.leaseweb.net. (40)
07:18:29.980770 ARP, Request who-has 192.168.1.1 tell 192.168.1.105, length 28
07:18:30.489591 IP 192.168.1.105.51742 > 192.168.1.1.53: 62153+ A? mirror.nl.leaseweb.net. (40)
07:18:30.489598 IP 192.168.1.105.51742 > 192.168.1.1.53: 56488+ AAAA? mirror.nl.leaseweb.net. (40)
07:18:30.984128 ARP, Request who-has 192.168.1.1 tell 192.168.1.105, length 28
07:18:31.987470 ARP, Request who-has 192.168.1.1 tell 192.168.1.105, length 28
07:18:35.494697 ARP, Request who-has 192.168.1.1 tell 192.168.1.105, length 28
07:18:36.497470 ARP, Request who-has 192.168.1.1 tell 192.168.1.105, length 28

That definitely suggests the router stops responding to your computer -- I don't have an explanation for that. Perhaps try changing your network cable and switchport? If you have a managed switch, see if there are any errors/logs on it that could explain it.

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#9 2015-09-18 06:59:53

tomass
Member
From: Odolena Voda, Czech Republic
Registered: 2014-02-11
Posts: 9
Website

Re: Loosing connection

I do not get it.

All other devices are fine. Even when I boot LIVE system on the same machine it works fine. Only this one installation has some problem. I think there must be something wrong with the configuration. Could there be some conflicting configuration in static vs. dynamic IP assignment?

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#10 2015-09-20 22:54:35

fukawi2
Ex-Administratorino
From: .vic.au
Registered: 2007-09-28
Posts: 6,231
Website

Re: Loosing connection

What router do you have? The other thread was a Netgear R7000.

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BlueHackers // fscanary // resticctl

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#11 2015-09-30 17:12:51

tomass
Member
From: Odolena Voda, Czech Republic
Registered: 2014-02-11
Posts: 9
Website

Re: Loosing connection

I have a TL-WR1043ND

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#12 2015-10-02 19:31:09

tomass
Member
From: Odolena Voda, Czech Republic
Registered: 2014-02-11
Posts: 9
Website

Re: Loosing connection

Alright. I finally found a solution.

https://bbs.archlinux.org/viewtopic.php?id=201459

setting mtu to 9000 helped

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#13 2015-10-03 02:01:36

fukawi2
Ex-Administratorino
From: .vic.au
Registered: 2007-09-28
Posts: 6,231
Website

Re: Loosing connection

That's a strange bug. Glad you found a workaround smile

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