Category Archives: Technology and Society

Administrative, Technology and Society

SSH Problems

4 Comments

OK, so I’ve upgraded my laptop to Fedora 15, and want to restore the backup, but I can’t ssh into it. Here’s what happens:

[simberg@linux-host ~]$ ping 192.168.0.105
PING 192.168.0.105 (192.168.0.105) 56(84) bytes of data.
64 bytes from 192.168.0.105: icmp_req=1 ttl=64 time=0.250 ms
64 bytes from 192.168.0.105: icmp_req=2 ttl=64 time=0.243 ms
64 bytes from 192.168.0.105: icmp_req=3 ttl=64 time=0.225 ms
64 bytes from 192.168.0.105: icmp_req=4 ttl=64 time=0.261 ms
^C
— 192.168.0.105 ping statistics —
4 packets transmitted, 4 received, 0% packet loss, time 3001ms
rtt min/avg/max/mdev = 0.225/0.244/0.261/0.023 ms
[simberg@linux-host ~]$ ssh 192.168.0.105
ssh: connect to host 192.168.0.105 port 22: No route to host
[simberg@linux-host ~]$

So I can ping it, but it won’t connect. I’ve installed opensshd on the laptop, I’ve enabled it, and the firewall has port 22 open. I can also ssh into it from a terminal on the machine (e.g., ssh localhost or ssh 192.168.0.105), but not from another computer on the network. Any ideas?

Administrative, Technology and Society

Ethernet Bleg

7 Comments

So I’m backing up my laptop in preparation for an upgrade from Fedora 13 to 15, and I notice that the data transfer speed is only about half a meg per second. Here is the output of ‘ethtool eth0’:

Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: No
Link partner advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
drv probe ifdown ifup
Link detected: yes

Any ideas what the problem is?

Business, Media Criticism, Political Commentary, Science And Society, Space, Technology and Society

My Talk With Alan Boyle

6 Comments

For those people who foolishly thought that the Republican debate was more important than my conversation with Alan Boyle tonight, the podcast is up now.

[Update]

It’s all ME, ME, ME, over at Cosmic Log tonight.

So if you’ve had enough of me, don’t go there.

[Thursday morning update]

Related thoughts from Rick Tumlinson.

[Update a few minutes later]

Man, many of the comments over at Cosmic Log are typical, in their rampant ignorance and straw men.

Business, Economics, Political Commentary, Space, Technology and Society

Space Interview Tonight

11 Comments

Alan Boyle of MSNBC will be interviewing me in Second Life tonight on Virtually Speaking Science at 6 PM SL time (PDT). Here’s the SLURL for SLers: http://slurl.com/secondlife/StellaNova/228/226/38

This is the promo:

Alan Boyle talks with Rand Simberg

As MSNBC.com’s science editor, Alan runs a virtual curiosity shop of the physical sciences and space exploration, paleontology, archaeology and other ologies that strike his fancy. Alan is the author of “The Case for Pluto,” a contributor to “A Field Guide for Science Writers,” and the blogger behind Cosmic Log, the 2008 recipient of the National Academies
Communication Award.

Rand Simberg describes himself as ‘just a recovering aerospace engineer.’ The Competitive Enterprise Institute describes him as ‘an expert on space technology and policy, particularly with regard to NASA and commercial human spaceflight.’ He writes widely about the politics and economics of space exploration. Read him in Popular Mechanics and Transterrestrial Musings – Biting Commentary about Infinity and Beyond! Watch him on YouTube. | Listen live and later on BTR

And yes, it will probably conflict with the Republican debate.