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Knowledge Base

NAT table saving lead to original network connection disable to switch

Publication Date:  2012-09-22  |   Views:  298  |   Downloads:  0  |   Author:  c00222574  |   Document ID:  EKB1000015777

Contents

Issue Description


Version: Huawei Versatile Routing Platform Software
VRP (R) software, Version 5.90 (AR1200 V200R001C01SPC300)

Topology: single AR1200 VM 3G network card switch
Failture:
1. Open the windows DOS dialog box, continual ping one address, command: ping www.huawei.com –t, can return packets normally.
2. Pull out main 3G card at the moment, System begin switching to backup 3G network card.
3. ping www.huawei.com –t and cannot return packets normally after pull out main 3G card.
4. 10 seconds later, backup network card start to work, original opened ping www.huawei.com –t is blocked.but open a DOS dialog box again, ping www.huawei.com –t, can receive the return packets normally.

Alarm Information

Dec 8 2011 14:25:17+00:00 Huawei %%01IFPDT/4/DRVICOUTSTR(l)[3]:3G module on Cellular0/0/0 is removed!
[Huawei]
Dec 8 2011 14:25:24+00:00 Huawei %%01IFPDT/4/IF_STATE(l)[4]:Interface Cellular0/0/0 has turned into DOWN state.
[Huawei]
Dec 8 2011 14:25:24+00:00 Huawei %%01PPP/4/PHYSICALDOWN(l)[5]:On the interface Cellular0/0/0, PPP link was closed because the status of the physical layer was Down.
[Huawei]
Dec 8 2011 14:25:24+00:00 Huawei %%01IFNET/4/LINK_STATE(l)[6]:The line protocol on the interface Cellular0/0/0 has entered the DOWN state.
[Huawei]
Dec 8 2011 14:25:24+00:00 Huawei %%01IFNET/4/LINK_STATE(l)[7]:The line protocol PPP IPCP on the interface Cellular0/0/0 has entered the DOWN state.
[Huawei]
Dec 8 2011 14:25:24+00:00 Huawei %%01RM/4/IPV4_DEFT_RT_CHG(l)[8]:IPV4 default Route is changed. (ChangeType=Delete,InstanceId=0,Protocol=Static,ExitIf=Cellular0/0/0,Nexthop=41.52.2.237,Neighbour=0.0.0.0,Preference=1,Label=NULL,Metric=0)
[Huawei]
Dec 8 2011 14:25:27+00:00 Huawei %%01IFPDT/4/IF_STATE(l)[9]:Interface Cellular0/0/1 has turned into UP state.
[Huawei]
Dec 8 2011 14:25:27+00:00 Huawei %%01IFNET/4/LINK_STATE(l)[10]:The line protocol on the interface Cellular0/0/1 has entered the UP state.
[Huawei]
Dec 8 2011 14:25:29+00:00 Huawei %%01IFNET/4/LINK_STATE(l)[11]:The line protocol PPP IPCP on the interface Cellular0/0/1 has entered the UP state.
3G

Handling Process


1. Test whether the 2 3G network card can work normally.
2. The network is normal after 3G network card switched, but original session is blocked, it means original session did not update to new 3G network card automaticly.
3. New ping can return packet normally, it means the whole process from PC to internet is normal, contain PC address, NAT switch, PPP get address automaticly.
4. Original ping cannot return packets, it means original ping packets did not update nat table.
5. Reset nat table after interface switched, it can solve the problem, the way to solve the problem is adding one configuration: nat link-down reset-session enable

Root Cause

NULL

Suggestions

NULL