Runcible's questions

I'm trying to create two routes --

Send all packets with IP protocol version 100 to 1.1.1.1 (via device eth1)
Send all other IP packets to 2.2.2.2 (via device eth2)

Reviewing the man pages of ip-route and ip-rules, it seems like I should be able to do this, but I haven't been able to figure out the correct syntax.

This article has an example of how to setup a policy-based routing, but it's based on source IP address, not protocol number: http://blog.scottlowe.org/2013/05/29/a-quick-introduction-to-linux-policy-routing/

Is it possible to create protocol-based routing rules?

I know I can add latency to an interface using this command:

# tc qdisc add dev eth0 root netem delay 50ms

In addition to latency, I want to limit the bandwidth of this interface to 100kbps.

How can I do this?

I've seen some examples of how to limit the bandwidth. For example:

# tc qdisc add dev eth0 root handle 1: cbq avpkt 1000 bandwidth 10mbit 

# tc class add dev eth0 parent 1: classid 1:1 cbq rate 512kbit \
  allot 1500 prio 5 bounded isolated 

# tc filter add dev eth0 parent 1: protocol ip prio 16 u32 

But if I try to run these commands after setting up the latency delay, I get errors that look like this:

RTNETLINK answers: File exists

For example:

# tc qdisc add dev eth0 root netem delay 97ms
# tc qdisc add dev eth0 root handle 1: cbq avpkt 1000 bandwidth 10kbit
RTNETLINK answers: File exists

I really want to be able to do both: Limit the bandwidth AND introduce a latency delay. Does anyone know how to accomplish this?

Inside the /etc/tomcat6/tomcat6.conf file, the JAVA_OPTS configuration line gives me the ability to set memory limits for Tomcat.

For example:

JAVA_OPTS="-Xms256M -Xmx1024M -XX:MaxPermSize=256m -XX:PermSize=128m"

Is there a way to disable memory limits for Tomcat entirely? I want Tomcat to make use of all available memory - I don't want to artificially limit the JVM with these parameters.

Alternatively, is there any harm in making these limits really large?

In bash, I can do something like this:

echo "The name of this script is $0"

Is there a way to do something similar in expect?

My company runs an internal DNS for mycompany.example

There is a machine on the network that I need to find, but I’ve forgotten its name. If I could see a list, it would probably jog my memory.

How can I list all of the domain records for mycompany.example?

Here's what I'm sure is an easy one, but I can't figure it out.

I have two files:

file1: You are in a maze of twisty little passages, all alike
file2: You are in a maze of twisty little* passages, all alike

I want to perform sdiff on these files, but I want to ignore the * character.

How do I do this?

How dangerous is it to interrupt an fsck?

Has anyone had any direct experience doing this?

I have a directory full of files ending with .xxx. (Apple.xxx, Orange.xxx, Bannana.xxx)

I want to change their extensions to .yyy. (Apple.yyy, Orange.yyy, Bannana.yyy)

What's the quickest way to accomplish this using basic shell commands?

I have a giant file (>20 gigs) sitting on my source machine and I need to transfer it to my target machine. For the purposes of this question, let's assume that I do not have network connectivity between the two machines.

I need to break this file into a series of smaller files, write the smaller files to DVD(s), then re-assemble everything on the target machine.

Both source and destination machines are Linux boxes. Is there a way to accomplish this using tar? I have a feeling that I need to use the --multi-volume parameter. What are my options?

I need to be able to specify the size of the volume files, in order to make sure that each one will fit onto a single DVD.

Thanks!

I'm trying to mount a remote Windows share directory on a Linux server. I can access the Windows share from other Windows boxes without any difficulty - but I need to be able to access it from the Linux server as well.

The command that I'm using is:

$ mount -t cifs //172.16.0.20/share . -o user=USERNAME
Password:
mount error(66): Object is remote
Refer to the mount.cifs(8) manual page (e.g.man mount.cifs)

This error seems pretty generic and the man pages aren't very helpful. Has anyone encountered this before?

I've had my desktop for ~4 years now, and recently it started behaving really badly:

Whenever I run a Flash webgame or anything that takes up a great deal of memory - like a game, for example - everything will work fine for awhile, but after 10-15 minutes, the computer comes to an immediate halt. The fan goes dead, the computer turns off, the monitor goes blank. It behaves as if someone has just yanked the power.

What are some things I can do to troubleshoot this problem?

Perhaps the CPU is overheating? Maybe I've got some bad RAM?

Although I don't think it matters, I'm running on Windows XP.

Note: I realize this isn't exactly a "system administration" question since I'm dealing with my own personal desktop and it's not really serving anything up to the outside world at the moment. However, I'm asking for general troubleshooting tips for the symtoms described above - Symptoms that I think could easily be applied to computers/servers in general. If you don't think this is appropriate, feel free to close.