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Author Archives: pim
An STP example within GNS3
Configuring a Spanning Tree in GNS3: ———————————— I found that configuring the SPT was always a bit vague due to the fact that dynamips / dynagen emulate Cisco IOS Routers, not switches. I didn’t find a simple example that tells … Continue reading
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First aid for Panic Dump Analysis on Solaris 10 / 11
1. Creat a “save” panic: # savecore -L 2. Decompress it; # savecore -vf /var/crash/vmdump.0 3. Load the panic dump in the kernel debugger: /var/crash# mdb -k /var/crash/unix.0 vmcore.0 4. Analyse.. See the processes that were running at the time … Continue reading
Posted in Solaris / linux
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Email notification on Solaris SMF service failures
1. First check that (send)mail works on Solaris # mailx -v root@localhost </etc/hosts Check that the mail is sent; # mailx ->> if mail does NOT work, make sure the /etc/inet/hosts file contains propper FQDN entries: 127.0.0.1 localhost 192.168.0.100 s11-server1 … Continue reading
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A Simple Role Base Access Control (RBAC) example on Solaris 11
1. create a user “user1″ and assign a password # useradd -d /export/home/user1 -m -s /bin/bash user1 # passwd user1 -> here password “user1234″ is used. 2. Create a role # roleadd -d /export/home/role1 -m role1 # passwd role1 -> … Continue reading
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A Simple Role Base Access Control (RBAC) example on Solaris 10
1. create a user “user1” and assign a password # useradd -d /export/home/user1 -m -s /bin/bash user1 # passwd user1 -> here password “user1234” is used. 2. Create a role # roleadd -d /export/home/role1 -m role1 # passwd role1 -> … Continue reading
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Subnetting exercises 2 of 2
2. A network administrator has been provided with the following block of class A IP addresses: 12.24.0.0/21. He has been asked to create at least 3 subnets with equal size netmasks, and the number of the hosts per subnet are … Continue reading
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Subnetting exercises 1 of 2
1. A network administrator has been provided with the following Class B block of IP addresses: 172.16.0.0/16 It is his task to subnet this Classful network to have (at least) 9 subnets available and maximize the number of hosts available … Continue reading
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How TomTom is loosing the plot
I have always loved TomTom’s navigators. Having accidentally blown up my seven year old TomTom go 300 recently, I was forced to buy a new one. The go 300 was an extremely reliable device with a fat battery that even … Continue reading
Posted in Non-Technical
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The Crossbow Solaris 11 Network Architecture
Crossbow is a wonderfull but complex network architecture that hardly bears any resemblence to the network stack found in previous Solaris relases. Whilst studying Crossbow I created an architectural overview that includes most,- but not all-, network configurations found in … Continue reading
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Tying flies on a Snowy Evening
Tying flies on a Snowy Evening, stolen from Robert’s Frost beautiful poem. Who’s fur this was I do not know he should be fleeing bears and kicking snow; it lies in zonkers before my eyes to tie in tails on … Continue reading
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