Re: [CentOS] delay in establishing network connectivity

2017-10-18 Thread Steven Tardy 

> On Oct 17, 2017, at 5:07 PM, FHDATA  wrote:
> 
> can not establish a network connectivity
> for some time: 7 to 15 minutes and then
> everything network wise is fine...

Over 5 minutes makes it sound like a ARP time-out somewhere(default gateway).
Does ifconfig show the interface as “UP”?
Does tcpdump show any packets coming in(background broadcast noise at least) or 
going out?
What does the upstream switch show?
Is spanning-tree blocking/listening/learning on the upstream switch?
Can arping get a response from the IP?
Does the upstream switch show that MAC address is learned on the right switch 
port?
Are you trying to use bonding/teaming as something could be waiting for LACP 
packets?
___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

Re: [CentOS] delay in establishing network connectivity

2017-10-17 Thread Andreas Benzler 
You need the systemd log as root:

journalctl -f -u NetworkManager

Sincerely

Andy

> Am 17.10.2017 um 23:07 schrieb FHDATA :
> 
> 
> hello,
> 
> centos 7
> 
> 
> If the system (wired static IP#) is powered down
> and stayed powered down for some period: let
> say 48 hours or so   when it is rebooted again it
> can not establish a network connectivity
> for some time: 7 to 15 minutes and then
> everything network wise is fine...
> 
> I am unable to spot any errors in various system logs.
> 
> If you think this is on the OS/system side 
> where do you think I should look to hunt down
> some parameter or settings that maybe causing this?
> 
> 
> 
> thank you,
> F-
> 
> ___
> CentOS mailing list
> CentOS@centos.org
> https://lists.centos.org/mailman/listinfo/centos

___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos

[CentOS] delay in establishing network connectivity

2017-10-17 Thread FHDATA 


hello,

centos 7


If the system (wired static IP#) is powered down
and stayed powered down for some period: let
say 48 hours or so   when it is rebooted again it
can not establish a network connectivity
for some time: 7 to 15 minutes and then
everything network wise is fine...

I am unable to spot any errors in various system logs.

If you think this is on the OS/system side 
where do you think I should look to hunt down
some parameter or settings that maybe causing this?



thank you,
F-

___
CentOS mailing list
CentOS@centos.org
https://lists.centos.org/mailman/listinfo/centos