a few random questions

[rashgash]

I'm still getting my feet wet with linux admin, but it's been easier than I thought.

What are all the different interfaces I'm seeing in "ip link show":

1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: shaper0: <> mtu 1500 qdisc noop qlen 10
link/ether
3: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether aa:00:00:73:06:42 brd ff:ff:ff:ff:ff:ff
4: tunl0: <NOARP> mtu 1480 qdisc noop
link/ipip 0.0.0.0 brd 0.0.0.0
5: gre0: <NOARP> mtu 1476 qdisc noop
link/gre 0.0.0.0 brd 0.0.0.0
6: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
7: ip6tnl0: <NOARP> mtu 1460 qdisc noop
link/tunnel6 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00 brd 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00

I get lo and eth0, but what are the rest? Also, I'm a little confused about ntp. Do all the rimu boxes already synchronize their times, or do I have to install this myself?

Lastly, I installed "sar" but when I run it, I get:

Cannot open /var/log/sysstat/sa19: No such file or directory

Any idea how to get the logging working?