Internet connection lost, when ISP changes IP address.
My ISP is providing WAN IP address to my router by using DHCP. It's not possible to have static IP address here.
It's changing very often, some times only IP address will change and sometimes whole network will change.
Some times router will handle it whit out problems, but very often I will lost connection to internet. After this connection lost, it looks to be ok, BVI1 will have new IP address, and line seems to be up. but I can't use internet before I have proceed reload of IOS.
Router is 2801 and HWIC-ADSL1 card.
Line (wire) from house to ISP is measured, and signal seems to be good.
My ISP told me, they can see from they log files, that there had been at leas 20 different MAC address, requesting new IP address by DHCP? Is this normal? I've attached below terminal window output when reloading router, it's mentioned there too.
I did proceed #write erase, #reload, and created very basic configuration, could you please have a look at it, what might cause this problem? what I'm missing? I hope to have this part correct, before I start modifying it.
Here is running config:
! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Router ! boot-start-marker boot-end-marker ! logging message-counter syslog ! no aaa new-model dot11 syslog ip source-route ! ! ip dhcp excluded-address 10.10.1.1 10.10.1.199 ! ip dhcp pool LAN network 10.10.1.0 255.255.255.0 default-router 10.10.1.1 dns-server xxx.xxx.xxx.xxx ! ! ip cef no ipv6 cef multilink bundle-name authenticated ! ! voice-card 0 ! ! archive log config hidekeys ! ! bridge irb ! ! interface FastEthernet0/0 ip address 10.10.1.1 255.255.255.0 ip nat inside ip virtual-reassembly duplex auto speed auto ! interface FastEthernet0/1 no ip address shutdown duplex auto speed auto ! interface ATM0/3/0 no ip address no atm ilmi-keepalive dsl operating-mode auto ! interface ATM0/3/0.1 point-to-point bridge-group 1 pvc 0/100 encapsulation aal5snap ! ! interface BVI1 ip address dhcp ip nat outside ip virtual-reassembly ! ip forward-protocol nd no ip http server no ip http secure-server ! ! ip nat inside source list 1 interface BVI1 overload ! access-list 1 permit 10.10.1.0 0.0.0.255 ! ! control-plane ! bridge 1 protocol ieee bridge 1 route ip ! ! mgcp fax t38 ecm mgcp behavior g729-variants static-pt ! ! line con 0 line aux 0 line vty 0 4 login ! scheduler allocate 20000 1000 end
This is taken from terminal output, when reloading router:
*Mar 1 22:23:50.963: %LINEPROTO-5-UPDOWN: Line protocol on Interface VoIP-Null0, changed state to up *Mar 1 22:23:50.963: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0/3/0, changed state to down *Mar 1 22:23:52.623: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down *Mar 1 22:23:52.923: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up *Mar 1 22:23:54.283: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to up *Mar 1 22:24:06.439: Note: A random mac address of 0000.0c77.a5f8 has been chosen for BVI in bridge group 1 since there is no mac address associated with the selected interface. *Mar 1 22:24:06.439: Ensure that this address is unique.
*Mar 1 22:24:06.675: Note: A random Spanning Tree Bridge Identifier address of 0000.0ab8.a6f4 has been chosen for Bridge Group 1 since there is no mac address associated with the selected interface. *Mar 1 22:24:06.675: Ensure that this address is unique.
*Mar 1 22:24:06.787: %SYS-5-CONFIG_I: Configured from memory by console *Mar 1 22:24:07.511: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI1, changed state to up *Mar 1 22:24:07.619: %SYS-5-RESTART: System restarted -- Cisco IOS Software, 2801 Software (C2801-SPSERVICESK9-M), Version 12.4(24)T1, RELEASE SOFTWARE (fc3) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2009 by Cisco Systems, Inc. Compiled Fri 19-Jun-09 16:36 by prod_rel_team *Mar 1 22:24:07.627: %SNMP-5-COLDSTART: SNMP agent on host Router is undergoing a cold start *Mar 1 22:24:07.839: %SYS-6-BOOTTIME: Time taken to reboot after reload = 159 seconds *Mar 1 22:24:08.291: %LINK-5-CHANGED: Interface FastEthernet0/1, changed state to administratively down *Mar 1 22:24:18.395: %LINK-3-UPDOWN: Interface BVI1, changed state to down *Mar 1 22:24:19.395: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI1, changed state to down *Mar 1 22:24:43.243: %LINK-3-UPDOWN: Interface ATM0/3/0, changed state to up *Mar 1 22:24:44.243: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0/3/0, changed state to up *Mar 1 22:24:45.243: %LINK-3-UPDOWN: Interface BVI1, changed state to up *Mar 1 22:24:46.243: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI1, changed state to up *Mar 1 22:25:20.939: %DHCP-6-ADDRESS_ASSIGN: Interface BVI1 assigned DHCP address xxx.xxx.xxx.xxx, mask 255.255.240.0, hostname Router
*Mar 1 22:26:13.419: %DHCPD-4-PING_CONFLICT: DHCP address conflict: server pinged 10.10.1.200. <-------- This was my desktop IP address, on that time.
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