Some time ago I was showing nmap to a trainee in the company I was working at that time. I used my home network and suddenly my ssh connection terminated. After I was able to log in again I received a mail from RANCID that there was a crash info file on the router.
I tried nmap again and nothing happened. After a couple of minutes I remembered that I read an article about the Cisco IOS DNS server. I had configured it on my router but didn’t save the config. After activating the DNS server again I was able to crash the router via nmap or telnet to port 53/tcp.
I reported this bug to Cisco and they published an advisory yesterday.
There are some more advisories at http://www.cisco.com/go/psirt/. Happy upgrading.
Yesterday evening I was giving a presentation about IPv6 at the first sage@guug Meeting in NÃ¼rnberg. There were more than 30 people. Quite a success for an uninteresting topic everybody knows about (That’s what I was told when I submitted the talk to one of Germany’s biggest Linux events . Slides (in German) can be found here.
We are looking for some people willing to talk at our next meetings. If you like to be informed about the next meetings, please subscribe to our mailing list.
First meeting will be on March 25th, 19:00. I’ll be talking about IPv6. The talk will be in German. For further details see:
I answered a call for papers for one of Germany’s biggest Linux events. They promised to notify the potential speakers on March 7th.
Papers are due in about two weeks. I still have no answer. I’ll guess that the topic (IPv6 introduction and some advanced stuff) I was going to talk about is not interesting enough.
Well okay,l I’m only asked by 5 or 6 people to come to travel around Germany and talk about IPv6. But maybe this only shows that IPv6 is not an interesting topic.
A month ago I wrote an article about activating IPv6 for blog.quux.de. Back than I had 17 unique IPv6 addresses. I just checked: 58 IPv6 unique addresses. Lets wait another couple of month.
I’ll have a glass or two tonight.
If I’m not answering the phone right away there is a reason. I’m in a meeting or otherwise occupied. I usually call back asap (If you don’t suppress your number). There is no need to call every 3 or. 4 minutes.
There are several books on IPv6. Two of my favorites are
Deploying IPv6 Networks (amazon.de)
IPv6 in Practice: A Unixer’s Guide to the Next Generation Internet (amazon.de)
Deploying IPv6 Networks covers IPv6 basics and IPv6 networking (routing, mutlicast, QoS, …) using Cisco devices. IPv6 in Practice: A Unixer’s Guide to the Next Generation Internet covers the *NIX side including Debian GNU/Linux, Solaris and FreeBSD.
I was just wondering about this “strange” error message:
jens@bowmore:~$ sh ip addr dev eth0
/bin/ip: /bin/ip: cannot execute binary file
Then I remembered. It’s a Linux shell not an IOS prompt. I should get more sleep or something to drink. Or maybe both.
Sage stands for system administrators guild, GUUG for German Unix User Group. There are monthly meetings in several German city’s (Berlin, Hamburg, Munich) where you can meet other people working with IT exchange information and so on. Most of the time there will be a talk about some interesting technical topic and then the meetings is relocated to a nearby restaurant to have some food and some beers. Talks are free, you only have to pay for your food and drinks. No membership in the GUUG is required.
If anybody is interested in a sage@guug Group in NÃ¼rnberg visit http://www.guug.de/lokal/nuernberg/index.html and subscribe to the mailing list.