Re: [uml-user] Speed problem starting brctl

[tim d. <ti...@on...>]

Have you done a tcpdump to see whats moving accross the bridge during 
the 4 hour downtime?


Brian Ellis wrote:

>Hi,
>
>My problem is that when the system first boots up, it takes an extremely
>long time (read 4+ hours) for my UML to respond on a public IP address.
>Lets say that I have a UML configured to listen on both public IP
>address 1.2.3.4 and private IP address 192.168.1.1
>
>When the UML boots, the private IP address is immediately active. Then,
>in about 4 hours the system begins to also respond on the public IP
>address. 
>
>When the system first boots, I have a script running the following: 
>
>	# Load the tun module
>        modprobe tun
>
>        # Remove the ip addresses of the devices
>        ifconfig eth0 0.0.0.0 promisc up
>        ifconfig eth1 0.0.0.0 promisc up
>
>        # Add the internal uml-bridge 
>        brctl addbr uml-int0
>        brctl setfd uml-int0 1
>        brctl sethello uml-int0 1
>        brctl stp uml-int0 off
>
>        ifconfig uml-int0 0.0.0.0 promisc up
>
>        brctl addif uml-int0 eth0
>(Just in case you were wondering... eth0 is our internal interface, eth1
>is the external interface)
>
>	# Add the external uml-bridge
>        brctl addbr uml-ext0
>        brctl setfd uml-ext0 1
>        brctl sethello uml-ext0 1
>        brctl stp uml-ext0 off
>
>        ifconfig uml-ext0 0.0.0.0 promisc up
>
>        brctl addif uml-ext0 eth1
>
>Then when the UML boots it runs 
>	tunctl -t uml-test0
>	tunctl -t uml-test1
>	ifconfig uml-test0 promisc up
>	ifconfig uml-test1 promisc up
>	brctl addif uml-ext0 uml-test0
>	brctl addif uml-int0 uml-test1
>
>So then to run the UML I use the command
>
>	linux mem=128M ubd0=UML_rootfs eth0=tuntap,uml-test0
>eth1=tuntap,uml-test1 umid=test
>
>After the UML is shut down, I run 
>	brctl delif uml-ext0 uml-test0
>	brctl delif uml-int0 uml-test1
>	ifconfig uml-test0 down
>	ifconfig uml-test1 down
>	tunctl -d uml-test0
>	tunctl -d uml-test1
>
>And for the most part this works great. Like I said, it takes about 4
>hours for the public IP address to work though. I also had the same
>problem if I tried to change which UML was bringing up a public IP
>address (switching from one UML to another). I imagine I am probably
>just doing something stupid along the way. Once the first public IP
>address is active, I can bring up a second UML on a different public IP
>address and it is immediately available. 
>
>My setup:
>
>Host: RedHat 7.3 with kernel 2.4.26 with SKAS3 and /dev/anon patch
>brctl version: 0.9.3-4
>UML kernel: 2.6.6 (with UML patch of course)
>UML file system: Debian stable
>ISP: Road Runner
>
>Thanks!
>
>
>
>
>-------------------------------------------------------
>This SF.Net email is sponsored by BEA Weblogic Workshop
>FREE Java Enterprise J2EE developer tools!
>Get your free copy of BEA WebLogic Workshop 8.1 today.
>http://ads.osdn.com/?ad_id=5047&alloc_id=10808&op=click
>_______________________________________________
>User-mode-linux-user mailing list
>Use...@li...
>https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
>
>  
>

-- 
Timothy Doyle
Senior Software Engineer

New Generation Media
ti...@un...
707-360-1428
2455 Bennett Valley Rd.
Suite A215
Santa Rosa, CA 95404
*/\/\/\/\/\/\/\/\/\/\/*