Apps slow down when net cable connected

[Noip]

Hi all,

A few weeks ago, I had a network prob. Since then, I noticed a general slow down of my apps when I start them. But today, evry'thng got confused.

During boot up, my PC took several minutes only to start the ldp service. Then it would take some 4 minutes for sendmail and then I got too upset to wait for the service smclient to start.

Fortunately I got the idea of removing my Network cable and I ctrl-alt-del the whole thing to restart. No prob. occured this time during boot up! On my desktop my apps would start immediately i.e Evo Ximian and VMware.

My IPs are set dynamically.

I noticed the following:

when I 'service network restart' with the cable plugged, my apps would start slowly
when I do that with the cable unplugged, my apps would start normally..

Any idea....

 

[Noip]

Any suggestions welcome !

 

[thedaver]

Bad wiring or bad NIC

Surfinbox.com Business Internet Services - National Dialup, DSL, T-1 and more.

http://www.surfinbox.com/business/

 

[kjwoo]

My guess is that it's trying to do DNS lookups and failing. As for why it's failing, I have no idea -- I'd have to see it and play around with it to tell you that.

Some things to check would include whether your DHCP client is being run before or after the network services (lpd and sendmail) are started.

Cheers,

~kj

 

[Noip]

Thanks for your input


1. LDP and sendmail are being started after the network service start

2. Facts with app. OpenOffice Calc

(a) When network active with DNS configured: app. takes 37s - 38s to load

(b) When network active with no DNS specified: app. takes 17s to load

(c) When network inactive: app. takes 1-2 s to load

3. I'm running win98 also on that PC and I don't have any network prob that could indicate bad wiring or bad network card. Moreover I have tested Linux with another nic but still same prob.

Thanks for more input!

 

[Noip]

There's something I have not tried though: Renew the IP on that Linux OS.

Can someone gives me command.

Thanks!

 

[PzP1R8]

Don't know if this is related to your time outs or chattering problems?

We had problems with our Linux System chattering on our network and slowing things down:

We had to edit this entry on the Linux Server and patch all the Sun Solaris Workstation with the latest NFS patch because of it!

Edit the localoptions line in /etc/rc.d/init.d/autofs to read
localoptions='rsize=8192,wsize=8192'

Something to do with re-transmissions of fragmented packets being too big and saturating the local network?

Hope it helps,

Tp

 

[benjithegreat98]

I had this problem w/ sendmail but I had a static IP. I have since quit using that PC but it seems the way I solved it was to check on the /etc/hosts file. Since you have DHCP if may not be an issue, but try to see if the format of the file is correct.

127.0.0.1 localhost
1.2.3.4 testpc.domain.tld testpc

Just for kicks, give it a static IP w/ the correct /etc/hosts file setup and see if it still happens.

 

[Noip]

1. With a static IP + entry above (with my computername and IP )added, app takes more than 1 minute to start. (Even longer)

2. localoptions='rsize=8192,wsize=8192' + service network restart - same prob

3. FOrcing the box to renew th IP i.e
'/sbin/ifdown eth0' then
'/sbin/ifup eth0'
Same prob with apps

Any more input?

 

[stanhubble]

what does your /etc/resolv.conf look like?
are the nameserver entries valid?

 

[Noip]

search mydomain
nameserver my_local_DNS_IP
nameserver my_ISP_Pri_DNS_IP
nameserver my_ISP_Sec_DNS_IP

<Looks OK>

 

[stanhubble]

how does nslookup respond (speed wise) when resolving ip's for :
- hosts that you are trying to mount filesystems from
- hosts that you have printers defined for (ldp = lpd ?)
- any smarthosts that you have defined in sendmail

what does your routing table look like to get to these hosts? (netstat -nr)