depuração de “interface eth usando IP errado” no servidor

Question

Meu Uni me forneceu dois nomes de host e IPs estáticos para duas interfaces no meu servidor Fedora 23. Minha idéia é usar um nome de host para produção e outro para ramificações dev. Deve funcionar como: bio-db.uni.edu na interface eno2 com xxx.xxx.86.24 IP e bio-db-dev.uni.edu em eno1 com xxx.xxx.86.64 IP. O servidor é CherryPy (duas instâncias vinculadas a determinados IPs estáticos)

Eu executei uma interface eno2 por meses agora, mas quando abri a segunda interface com ifconfig eno1 up , recebi uma mensagem do departamento de TI informando que há um conflito:

Network access for xx:xx:xx:xx:xx:71 (bio-db.uni.edu) has been disabled at 04/26/16 15:34:54:

  Reason: Host using incorrect IP address
    MAC xx:xx:xx:xx:xx:71 IP xxx.xxx.xxx.64 found in rtr30 cache
  Switch: switch.uni.edu
  Port:   52051

Parece um pouco aleatório: em algum momento eno1 fica desativado, às vezes eno2 , mas eles sempre misturam esses dois IPs.

Como posso depurar isso? Estou em contato com o pessoal de TI, mas também quero saber se isso é algo que meu saque está fazendo errado. Quais logs podem me ajudar?

Quando os IPs são alocados pelo DHCP, os hosts se tornam acessíveis, supostamente, meu ifconfig se parece com isso logo depois que eu levanto as interfaces:

# uname -a
Linux bio-db.uni.edu 4.3.5-300.fc23.x86_64 #1 SMP Mon Feb 1 03:18:41 UTC
2016 x86_64 x86_64 x86_64 GNU/Linux

# ifconfig eno1 <-- is 'bio-db-dev.uni.edu'
eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet xxx.xxx.86.64 netmask 255.255.254.0 broadcast xxx.xxx.87.255
inet6 __IPV6__ prefixlen 64 scopeid 0x20<link>
ether xx:xx:xx:xx:xx:70 txqueuelen 1000 (Ethernet)
RX packets 63597 bytes 10057016 (9.5 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2504 bytes 1899384 (1.8 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 16

# ifconfig eno2 <-- is 'bio-db.uni.edu'
eno2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet xxx.xxx.86.24 netmask 255.255.254.0 broadcast xxx.xxx.87.255
inet6 __IPV6__ prefixlen 64 scopeid 0x20<link>
ether xx:xx:xx:xx:xx:71 txqueuelen 1000 (Ethernet)
RX packets 11575 bytes 1834587 (1.7 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 417 bytes 68578 (66.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 17

Adicionada ip address e ip route listagem

# ip address
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 40:f2:e9:bd:97:70 brd ff:ff:ff:ff:ff:ff
    inet xxx.xxx.86.64/23 brd xxx.xxx.87.255 scope global eno1
       valid_lft forever preferred_lft forever
    inet6 fe80::42f2:e9ff:febd:9770/64 scope link 
       valid_lft forever preferred_lft forever
3: eno2: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 40:f2:e9:bd:97:71 brd ff:ff:ff:ff:ff:ff
    inet xxx.xxx.86.24/23 brd xxx.xxx.87.255 scope global eno2
       valid_lft forever preferred_lft forever
    inet6 fe80::42f2:e9ff:febd:9771/64 scope link 
       valid_lft forever preferred_lft forever
4: eno3: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether 40:f2:e9:bd:97:72 brd ff:ff:ff:ff:ff:ff
5: eno4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 40:f2:e9:bd:97:73 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.40/24 brd 192.168.0.255 scope global eno4
       valid_lft forever preferred_lft forever
    inet6 fe80::42f2:e9ff:febd:9773/64 scope link 
       valid_lft forever preferred_lft forever
6: ens1f0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether 90:e2:ba:b6:f7:34 brd ff:ff:ff:ff:ff:ff
7: ens1f1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether 90:e2:ba:b6:f7:35 brd ff:ff:ff:ff:ff:ff
8: enp0s20u13u5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 1000
    link/ether 42:f2:e9:bd:97:77 brd ff:ff:ff:ff:ff:ff
    inet 169.254.95.120/24 brd 169.254.95.255 scope link dynamic enp0s20u13u5
       valid_lft 541sec preferred_lft 541sec
    inet6 fe80::40f2:e9ff:febd:9777/64 scope link 
       valid_lft forever preferred_lft forever
9: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:00:d8:5d:36 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
10: virbr0-nic: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master virbr0 state DOWN group default qlen 500
    link/ether 52:54:00:d8:5d:36 brd ff:ff:ff:ff:ff:ff

# ip route
default via xxx.xxx.86.1 dev eno2  proto static  metric 100 
default via xxx.xxx.86.1 dev eno1  proto static  metric 101 
xxx.xxx.86.0/23 dev eno2  proto kernel  scope link  src xxx.xxx.86.24  metric 100 
xxx.xxx.86.0/23 dev eno1  proto kernel  scope link  src xxx.xxx.86.64  metric 101 
xxx.xxx.253.244 via xxx.xxx.86.1 dev eno2  proto dhcp  metric 100 
169.254.95.0/24 dev enp0s20u13u5  proto kernel  scope link  src 169.254.95.120  metric 100 
192.168.0.0/24 dev eno4  proto kernel  scope link  src 192.168.0.40  metric 100 
192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1