Dhcpcd giving 169 IP address

Question

I just got back to school. At home I was using my desktops wired connection just fine. When I got back to school I booted up my machine and tried to do a dhcpcd eth0 but the broadcasting for a lease times out and then I end up with a 169 IP. I've tried downgrading dhcpcd didn't work. I've tried a different NIC and I would get an IP but no DNS. I've tried different cable on the NIC that would get 169. I've tried plugging that NIC into a different port. I plugged my laptop into the port and that would get an IP just fine. My school does use some cisco NAC agent for authentication but the desktops MAC address is, or at least should be, on there whitelist. I've been fussing with this for like four days and the school IT people aren't very helpful. Heres the output from ip addr eth0 is the one getting a 169 and eth1 is the new NIC I put in to test...
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 54:04:a6:20:29:97 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::5604:a6ff:fe20:2997/64 scope link
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0a:cd:1f:01:a9 brd ff:ff:ff:ff:ff:ff
    inet 150.156.223.152/20 brd 150.156.223.255 scope global eth1
    inet6 fe80::20a:cdff:fe1f:1a9/64 scope link
       valid_lft forever preferred_lft forever
output of lspci the Intel is the on board NIC I normally use thats getting the 169, the realtek is one I borrowed to test.
02:00.0 Ethernet controller: Intel Corporation 82583V Gigabit Network Connection
    Subsystem: ASUSTeK Computer Inc. Device 8457
    Flags: bus master, fast devsel, latency 0, IRQ 97
    Memory at fe900000 (32-bit, non-prefetchable) [size=128K]
    I/O ports at d000 [size=32]
    Memory at fe920000 (32-bit, non-prefetchable) [size=16K]
    Capabilities: [c8] Power Management version 2
    Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [e0] Express Endpoint, MSI 00
    Capabilities: [a0] MSI-X: Enable- Count=1 Masked-
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [140] Device Serial Number 54-04-a6-ff-ff-20-29-97
    Kernel driver in use: e1000e
06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03)
    Subsystem: Realtek Semiconductor Co., Ltd. TEG-ECTX Gigabit PCI-E Adapter [Trendnet]
    Flags: bus master, fast devsel, latency 0, IRQ 98
    I/O ports at c000 [size=256]
    Memory at fe500000 (64-bit, non-prefetchable) [size=4K]
    Memory at d0000000 (64-bit, prefetchable) [size=16K]
    Expansion ROM at d0020000 [disabled] [size=128K]
    Capabilities: [40] Power Management version 3
    Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [70] Express Endpoint, MSI 01
    Capabilities: [ac] MSI-X: Enable- Count=4 Masked-
    Capabilities: [cc] Vital Product Data
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [140] Virtual Channel
    Capabilities: [160] Device Serial Number 81-07-00-00-68-4c-e0-00
    Kernel driver in use: r8169
I've even gone through and gotten ride of the /etc/dhcpcd.conf and seeing if that would work but it didn't. The problem could be on the schools side but my troubleshooting results tell me it could be either or. Does anybody have any ideas? I'm stumped
Thanks for all the help

Answer 1

My dhcpcd.conf file is...
nohook resolv.conf
noipv6rs
My resolv.conf is...
nameserver 150.156.208.2
My sysctl.conf is...
# Configuration file for runtime kernel parameters.
# See sysctl.conf(5) for more information.
# Have the CD-ROM close when you use it, and open when you are done.
#dev.cdrom.autoclose = 1
#dev.cdrom.autoeject = 1
# Protection from the SYN flood attack.
net.ipv4.tcp_syncookies = 1
# See evil packets in your logs.
#net.ipv4.conf.all.log_martians = 1
# Never accept redirects or source routes (these are only useful for routers).
#net.ipv4.conf.all.accept_redirects = 0
#net.ipv4.conf.all.accept_source_route = 0
#net.ipv6.conf.all.accept_redirects = 0
#net.ipv6.conf.all.accept_source_route = 0
# Disable packet forwarding.
net.ipv4.ip_forward = 0
net.ipv6.conf.all.forwarding = 0
#Disable IPv6
net.ipv6.conf.all.disable = 1
# Tweak the port range used for outgoing connections.
#net.ipv4.ip_local_port_range = 32768 61000
# Tweak those values to alter disk syncing and swap behavior.
#vm.vfs_cache_pressure = 100
#vm.laptop_mode = 0
#vm.swappiness = 60
# Tweak how the flow of kernel messages is throttled.
#kernel.printk_ratelimit_burst = 10
#kernel.printk_ratelimit = 5
# Reboot 600 seconds after kernel panic or oops.
#kernel.panic_on_oops = 1
#kernel.panic = 600
# Disable SysRq key to avoid console security issues.
kernel.sysrq = 0
And when I had Windows working it wasn't getting a good IP either, just a 169. I tried the windows trouble shooter or whatever and it kept telling me to check the router or something.