The Network area of the System Information program shows that (albeit a very small amount of) traffic has been sent and received from the device (about 1/10th of a MiB in each direction) but I am unable to even ping my router. Since the dmesg errors all seemed to revolve around IPv6 issues I set that to "Ignore" in my network settings but the problem still persists.
Here is the output of lsmod (r8168 is near the bottom):
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Module Size Used by
uas 17844 0
usb_storage 48838 1
bnep 18140 2
rfcomm 46619 12
parport_pc 32688 0
ppdev 17073 0
snd_hda_codec_hdmi 32007 1
coretemp 13400 0
snd_hda_codec_realtek 77876 1
kvm_intel 132759 0
kvm 414070 1 kvm_intel
lp 17759 0
microcode 22803 0
snd_hda_intel 33491 5
snd_hda_codec 134212 3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep 13602 1 snd_hda_codec
serio_raw 13215 0
snd_pcm 96580 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
b43 369753 0
mac80211 539908 1 b43
parport 46345 3 parport_pc,ppdev,lp
cfg80211 206566 2 b43,mac80211
bcma 35656 1 b43
ssb_hcd 12869 0
snd_seq_midi 13324 0
snd_rawmidi 30512 1 snd_seq_midi
snd_seq_midi_event 14899 1 snd_seq_midi
snd_seq 61521 2 snd_seq_midi,snd_seq_midi_event
nouveau 895609 2
snd_timer 29425 2 snd_pcm,snd_seq
snd_seq_device 14497 3 snd_seq_midi,snd_rawmidi,snd_seq
lpc_ich 17061 0
mac_hid 13205 0
ttm 83595 1 nouveau
btusb 18334 0
drm_kms_helper 46784 1 nouveau
bluetooth 209199 22 bnep,rfcomm,btusb
snd 78734 20 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
drm 275528 4 nouveau,ttm,drm_kms_helper
i7core_edac 23571 0
soundcore 15047 1 snd
i2c_algo_bit 13413 1 nouveau
mxm_wmi 12979 1 nouveau
snd_page_alloc 18484 2 snd_hda_intel,snd_pcm
video 19335 1 nouveau
edac_core 52451 3 i7core_edac
wmi 19070 2 nouveau,mxm_wmi
hid_generic 12493 0
firewire_ohci 40401 0
usbhid 46947 0
firewire_core 64368 1 firewire_ohci
hid 100366 2 hid_generic,usbhid
crc_itu_t 12707 1 firewire_core
ssb 52036 2 b43,ssb_hcd
r8168 248516 0
pata_jmicron 12747 0
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[ 1.706310] eth%d: RTL8168C/8111C at 0xffffc9001179c000, 00:1f:bc:00:ca:4e, IRQ 44
[ 1.731301] eth0: Identified chip type is 'RTL8168C/8111C'.
[ 1.732391] eth%d: RTL8168C/8111C at 0xffffc9001179e000, 00:1f:bc:00:ca:4f, IRQ 45
[ 1.757407] eth1: Identified chip type is 'RTL8168C/8111C'.
[ 18.607988] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 18.607993] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[ 20.070279] r8168: eth0: link down
[ 20.070915] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 20.071911] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 20.095147] r8168: eth1: link down
[ 20.095819] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[ 20.096015] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[ 21.773455] r8168: eth1: link up
[ 21.774085] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[ 22.093928] r8168: eth1: link up
-Matt