09-15-2012 08:20 AM - edited 03-07-2019 08:54 AM
Hi,
I am having this strange issue.
The scenario is like this
Have 2 routers connected to two different ISP's and have different subnets.
When iam trying to give one of the WAN ip address of range of suppose router B to my pc it is giving ip address conflict with some mac address. When I searched, i found that the mac address is of one of the interface of router A . I tried giving other ip address in same Router B WAN range and still it is giving same error.
There is no physical connectivity between two routers , they are connected by switch.
Can anyone put some light on this matter.
Your help will be highly appreciated.
Thanks
Sent from Cisco Technical Support Android App
09-15-2012 09:44 AM
Hello Shakeer,
> There is no physical connectivity between two routers , they are connected by switch.
This may be enough a LAN switch is used to provide connectivity between different devices: if the switch ports are in the same Vlan ( same working group) the two routers can see each other and they may be sharing a common IP subnet.
> When iam trying to give one of the WAN ip address of range of suppose router B to my pc
You should give an IP address of the internal / LAN side of the router to your PC, otherwise you are bypassing the router itself!
The router should be configured for NAT ( Network Address Translation) in order to allow internet access to internal users
Hope to help
Giuseppe
09-17-2012 02:03 AM
Scenario look like this
The Public IP address was of one of the Server which I removed after getting this error and I am trying with PC.
09-17-2012 02:04 AM
Router A config:
Router A#sh run
Building configuration...
Current configuration : 3622 bytes
!
! Last configuration change at 14:19:01 UTC Sat Sep 15 2012
version 15.1
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
boot-start-marker
boot-end-marker
!
!
logging buffered 51200 warnings
enable password cisco
!
no aaa new-model
!
!
no ipv6 cef
ip source-route
ip cef
!
!
!
!
!
ip domain name yourdomain.com
ip name-server 212.93.192.4
ip name-server 212.93.192.5
!
multilink bundle-name authenticated
!
!
crypto pki token default removal timeout 0
!
crypto pki trustpoint TP-self-signed-234108546
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-234108546
revocation-check none
rsakeypair TP-self-signed-234108546
!
!
crypto pki certificate chain TP-self-signed-234108546
certificate self-signed 01
30820229 30820192 A0030201 02020101 300D0609 2A864886 F70D0101 05050030
30312E30 2C060355 04031325 494F532D 53656C66 2D536967 6E65642D 43657274
69666963 6174652D 32333431 30383534 36301E17 0D313130 38323630 38333830
375A170D 32303031 30313030 30303030 5A303031 2E302C06 03550403 1325494F
532D5365 6C662D53 69676E65 642D4365 72746966 69636174 652D3233 34313038
35343630 819F300D 06092A86 4886F70D 01010105 0003818D 00308189 02818100
F2215A0C A6163B63 BFBF37EC 2A4F4A7A 2BAE0991 A26D42F1 AB36E16D 7FB873E1
DEEFBDD3 87328BC1 5C3A0569 42FC1012 6592457A 34CDB248 F9D4DE60 C85BE7C5
3CA78C2D 3A61F0B8 5B9D461E 4F56A657 31109DC4 B37FCEEF D0409952 61ECD3BB
F23FD469 D41B026F BA639A56 810B5C15 A27B48D8 2E621AA5 2CD7AE19 D615A4E7
02030100 01A35330 51300F06 03551D13 0101FF04 05300301 01FF301F 0603551D
23041830 16801443 31BFDFF9 326BC11B 1C8E9CE9 CEBAE8CA FEF61830 1D060355
1D0E0416 04144331 BFDFF932 6BC11B1C 8E9CE9CE BAE8CAFE F618300D 06092A86
4886F70D 01010505 00038181 007BBF2E 5F7E6D77 B93A4364 58706683 062A1B73
CA1969C1 BF4056F6 BD2EE4D3 57200778 B14B9F5D 5885AC21 98538F92 CFCEADD4
AE495A9F B45A920F FDF0F608 7E952F73 C273E008 238DB316 D511B9E6 F35B3D99
C2597998 2E52958E F93A8CA0 56D14C80 A1BF6DFB 5F7EF8E1 9B514D81 5EB8EC40
2FFD9850 43AE79F6 8411A11A 85
quit
license udi pid CISCO2921/K9 sn FCZ1535717P
!
!
!
redundancy
!
!
!
!
!
!
!
!
!
!
!
interface Embedded-Service-Engine0/0
no ip address
shutdown
!
interface GigabitEthernet0/0
description #Connection to Awalnet#
ip address 192.168.179.110 255.255.255.252
duplex auto
speed auto
!
interface GigabitEthernet0/1
description #Connection to LAN#
ip address 78.93.10.1 255.255.255.224 secondary
ip address 192.168.10.4 255.255.255.0
duplex auto
speed auto
ip tcp adjust-mss 1350
duplex auto
speed auto
!
interface GigabitEthernet0/2
shutdown
no ip address
!
interface FastEthernet0/0/0
no ip address
shutdown
duplex auto
speed auto
!
interface ATM0/1/0
no ip address
no atm ilmi-keepalive
!
ip forward-protocol nd
!
ip http server
ip http access-class 23
ip http authentication local
ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
!
ip route 0.0.0.0 0.0.0.0 192.168.179.109
!
access-list 23 permit 10.10.10.0 0.0.0.7
!
!
!
!
!
!
control-plane
!
!
!
!
scheduler allocate 20000 1000
end
09-17-2012 02:05 AM
Router B#sh run
Building configuration...
Current configuration : 1578 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
!
boot-start-marker
boot-end-marker
!
no logging console
enable secret 5 $1$QylH$9Mi6oyFnYvqTralKmggml0
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no aaa new-model
ip subnet-zero
ip cef
!
!
!
!
ip name-server 213.230.0.10
ip name-server 213.230.0.20
no ftp-server write-enable
!
!
!
controller E1 0/0/0
framing NO-CRC4
channel-group 0 timeslots 1-31 speed 64
!
controller E1 0/0/1
!
!
interface FastEthernet0/0
ip address 172.16.243.126 255.255.255.252
duplex auto
speed 10
!
interface FastEthernet0/1
ip address 192.168.10.6 255.255.255.0 secondary
ip address 213.230.30.193 255.255.255.224 secondary
ip address 213.230.30.1 255.255.255.240
speed 100
full-duplex
no keepalive
!
interface FastEthernet0/1/0
switchport access vlan 100
no ip address
no keepalive
!
interface FastEthernet0/1/1
no ip address
shutdown
!
interface FastEthernet0/1/2
no ip address
shutdown
!
interface FastEthernet0/1/3
no ip address
shutdown
!
interface Serial0/0/0:0
description to MEDU.NET.SA
bandwidth 2048
no ip address
shutdown
!
interface Vlan1
no ip address
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.16.243.125
ip route 192.168.0.0 255.255.0.0 192.168.10.1
!
ip http server
!
snmp-server community public RO
disable-eadi
!
control-plane
!
banner login
end
09-17-2012 02:06 AM
Core switch config
Running configuration:
; J9091A Configuration Editor; Created on release #K.14.41
hostname "ProCurve Switch 8212zl"
module 1 type J8706A
module 2 type J8707A
module 3 type J9307A
module 4 type J8707A
module 5 type J9307A
module 6 type J8707A
module 7 type J8702A
module 8 type J8702A
module 9 type J8702A
module 10 type J8702A
module 11 type J8702A
module 12 type J8702A
ip routing
vlan 1
name "DEFAULT_VLAN"
untagged A1,A3-A24,C16,C18-C23,D2-D4,E5-E10,G1-G24,H1-H24,I1-I24,J1-J24,K1-K2
4,L1-L24
ip address 192.168.100.1 255.255.255.0
no untagged A2,B1-B4,C1-C15,C17,C24-D1,E1-E4,E11-E24,F1-F4
exit
vlan 11
name "JCCI_HQ_11"
untagged A2,E20-E22,F1
ip helper-address 192.168.10.7
ip address 192.168.11.1 255.255.255.0
exit
vlan 12
name "WLAN-JCCI-INTRANET_12"
untagged E12
ip helper-address 192.168.10.7
ip address 192.168.12.1 255.255.255.0
exit
vlan 13
name "JBIC_A_&_B_13"
untagged E17-E18
ip helper-address 192.168.10.7
ip address 192.168.13.1 255.255.255.0
exit
vlan 14
name "JCC_HQ_IP_CAMERAS_14"
untagged E16
ip helper-address 192.168.10.7
ip address 192.168.14.1 255.255.255.0
exit
vlan 15
name "JCCI_HQ_15"
untagged E13-E15
ip helper-address 192.168.10.7
ip address 192.168.15.1 255.255.255.0
exit
vlan 16
name "JCCI_HQ_16"
untagged E19,F3-F4
ip helper-address 192.168.10.7
ip address 192.168.16.1 255.255.255.0
exit
vlan 60
name "BRANCHES_FIREWALL_60"
untagged E11
ip address 192.168.60.1 255.255.255.0
exit
vlan 168
name "MANAGEMENT_VLAN_168"
ip address 192.168.168.1 255.255.255.0
exit
vlan 10
name "VLAN10"
untagged B1-B4,C1-C15,C17,D1,E1-E4,F2
ip address 192.168.10.1 255.255.255.0
exit
vlan 9
name "SSL-VPN"
untagged C24,E23-E24
-- MORE --, next page: Space, next line: Enter, quit: Control-C
ip address 192.168.11.1 255.255.255.0
exit
vlan 12
name "WLAN-JCCI-INTRANET_12"
untagged E12
ip helper-address 192.168.10.7
ip address 192.168.12.1 255.255.255.0
exit
vlan 13
name "JBIC_A_&_B_13"
untagged E17-E18
ip helper-address 192.168.10.7
ip address 192.168.13.1 255.255.255.0
exit
vlan 14
name "JCC_HQ_IP_CAMERAS_14"
untagged E16
ip helper-address 192.168.10.7
ip address 192.168.14.1 255.255.255.0
exit
vlan 15
name "JCCI_HQ_15"
untagged E13-E15
ip helper-address 192.168.10.7
ip address 192.168.15.1 255.255.255.0
exit
vlan 16
name "JCCI_HQ_16"
untagged E19,F3-F4
ip helper-address 192.168.10.7
ip address 192.168.16.1 255.255.255.0
exit
vlan 60
name "BRANCHES_FIREWALL_60"
untagged E11
ip address 192.168.60.1 255.255.255.0
exit
vlan 168
name "MANAGEMENT_VLAN_168"
ip address 192.168.168.1 255.255.255.0
exit
vlan 10
name "VLAN10"
untagged B1-B4,C1-C15,C17,D1,E1-E4,F2
ip address 192.168.10.1 255.255.255.0
exit
vlan 9
name "SSL-VPN"
untagged C24,E23-E24
ip address 192.168.9.1 255.255.255.0
exit
ip route 10.0.1.0 255.255.255.0 192.168.10.2
ip route 10.120.10.0 255.255.255.0 192.168.60.2
ip route 192.1.2.0 255.255.255.0 192.168.60.2
ip route 192.168.20.0 255.255.255.0 192.168.60.2
ip route 192.168.21.0 255.255.255.0 192.168.60.2
ip route 192.168.22.0 255.255.255.0 192.168.60.2
ip route 192.168.23.0 255.255.255.0 192.168.60.2
ip route 192.168.24.0 255.255.255.0 192.168.60.2
ip route 192.168.25.0 255.255.255.0 192.168.60.2
ip route 192.168.26.0 255.255.255.248 192.168.60.2
ip route 192.168.26.8 255.255.255.248 192.168.60.2
ip route 192.168.26.16 255.255.255.248 192.168.60.2
ip route 192.168.27.0 255.255.255.0 192.168.60.2
ip route 192.168.28.0 255.255.255.0 192.168.60.2
ip route 192.168.29.0 255.255.255.0 192.168.60.2
ip route 192.168.30.0 255.255.255.0 192.168.60.2
ip route 192.168.31.0 255.255.255.0 192.168.60.2
ip route 192.168.32.0 255.255.255.0 192.168.60.2
ip route 192.168.33.0 255.255.255.0 192.168.60.2
ip route 192.168.34.0 255.255.255.0 192.168.60.2
ip route 192.168.51.0 255.255.255.252 192.168.60.2
ip route 192.168.52.0 255.255.255.252 192.168.60.2
ip route 192.168.53.0 255.255.255.252 192.168.60.2
ip route 192.168.54.0 255.255.255.252 192.168.60.2
ip route 192.168.60.0 255.255.255.0 192.168.60.1
snmp-server community "public" unrestricted
spanning-tree
09-17-2012 02:09 AM
It was working fine since long time, but now iam getting this issue. Any Public Ip address in the range of Router B iam trying to give it shows Ip address conflict with the mac address of the Router A port connected to Switch. I tried connecting the different router A port to switch and again i got same ip address conflict msg with the port connected to switch.
Any idea?
Thanks..
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