Self-Assigned IP with my Ethernet

I have been having problems while on the internet at school. I will be logged in and on the internet perfectly fine(the Ethernet says connected). Then around 15 minutes later I disconnect from the internet and it says "Self-Assigned IP", where it used to say connected. I can't get back onto the internet until i restart my computer. This gets annoying having to restart my computer about every 15 minutes just to get on the internet. Any answers? Also here is a copy of my ifconfig under the terminal settings while the Ethernet says "Self-Assigned IP".
Last login: Wed Sep 10 23:47:08 on ttys000
michael-dishers-macbook:~ Dish$ ifconfig
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
inet 127.0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0 mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::217:f2ff:fedf:8c88%en0 prefixlen 64 scopeid 0x4
inet 169.254.160.9 netmask 0xffff0000 broadcast 169.254.255.255
ether 00:17:f2:df:8c:88
media: autoselect (10baseT/UTP <half-duplex>) status: active
supported media: autoselect 10baseT/UTP <half-duplex> 10baseT/UTP <full-duplex> 10baseT/UTP <full-duplex,hw-loopback> 10baseT/UTP <full-duplex,flow-control> 100baseTX <half-duplex> 100baseTX <full-duplex> 100baseTX <full-duplex,hw-loopback> 100baseTX <full-duplex,flow-control> 1000baseT <full-duplex> 1000baseT <full-duplex,hw-loopback> 1000baseT <full-duplex,flow-control> none
fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 2030
lladdr 00:1b:63:ff:fe:65:23:16
media: autoselect <full-duplex> status: inactive
supported media: autoselect <full-duplex>
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether 00:1b:63:09:13:bd
media: autoselect (<unknown type>) status: inactive
supported media: autoselect
michael-dishers-macbook:~ Dish$

Hmmm...
Ok, here's a couple of questions for you.
1) Is this in a dorm room or in a classroom?
2) Does this happen no matter where you plug in, or is it in a specific room?
Troubleshooting problems like this can be a pain, but you have to eliminate possible causes no matter how unlikely they seem to be.
A couple simple things to try:
Try another ethernet cable. If the cable you are using has a intermittent short or break, it could cause problems.
Try connecting to another ethernet connection. (That's why I asked if it was in a specific location.) You could just be plugging into a problematic jack.
Try those first, then if it still has the problem we'll go from there. You may want to check with your school's IT department and see if anyone else is reporting similar problems. Maybe they can lend a hand.

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