NATing to the virtual MAC address of an HSRP group problems...
Hello
I have a problem where I need to NAT various IP addresses, and need the NATd addresses to carry the virtual MAC address of the HSRP group on the onward travels..
By default, with the Cisco 871's I'm using, the packets are NATd, but carry the MAC address of the external interface.. not the virtual MAC address.
The problem is that when I failover to the standby 871, the packets will then have the MAC address of the standby (new active) 871. This causes problems because my next hop doesn't update its ARP tables (very infrequent updates).
The next hop will accept packets NATd by the standby (now live), but will continue to send reply (eg ICMP) to the live (now standby) because it hasn't updated its ARP table.
I know that I can create a NAT pool with the virtual IP address as the only member of the pool. Packets will then have the virtual MAC address, and the problem will be fixed, but if I need to NAT IP addresses to *different* NATd addresses, then I would have to create multiple HSRP groups, with different virtual IP's and MAC's, and then create multiple NAT pools...
If I can't get my next hop (which I have minimal control over) to refresh/update it's ARP table, then I will consider the multiple HSRP group config, but before I try that I would like to know whether I would be able to have multiple virtual IP's and MAC's on a single interface. Apparently there was a problem with the Catalyst 2500/4500 series where the same MAC address would be used for all HSRP groups, and you had to use burned-in MAC addresses for HSRP groups.. which wouldn't provide a solution in this case..
Any ideas on how to fix this would be greatly appreciated. BTW I have proxy-arp on external interface, and gratuitous arp.
My software version is:
Cisco IOS Software, C870 Software (C870-ADVSECURITYK9-M), Version 12.3(8)YI1, RELEASE SOFTWARE (fc1)
Synched to technology version 12.3(10.3)T2
Many thanks,
Michael Blake.
Hello Michael,
you might want to have a look at the documents below, describing two techniques developed for the problem of NAT in an HSRP environement:
NAT Stateful Failover of Network Address Translation.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t13/ftsnat.htm
NAT Static Mapping Support with HSRP for High Availability
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t4/ftnthsrp.htm
Regards,
GP
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I’m glad to be of help to you!
*** This response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you. Microsoft does not control these
sites and has not tested any software or information found on these sites; therefore, Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. There are inherent dangers in the use
of any software found on the Internet, and Microsoft cautions you to make sure that you completely understand the risk before retrieving any software from the Internet. ***
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Structure of DHCP scopes: Two DHCP server 50% to 50% all allocation for per scopes.
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allocate the IP address at the same time to the a strange MAC address per IP address, the type is "DHCP/BOOT", it cause DHCP scopes out of space at some time point. We need clear up them manually.
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Client IP Address
Name
Lease Expiration
Type
Unique ID
10.199.190.0
10.199.190.0
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e3000
10.199.190.46
10.199.190.46
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e343600
10.199.190.59
10.199.190.59
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e353900
10.199.190.69
10.199.190.69
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e363900
10.199.190.74
10.199.190.74
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e373400
10.199.190.90
10.199.190.90
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e393000
10.199.190.101
10.199.190.101
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31303100
10.199.190.104
10.199.190.104
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31303400
10.199.190.110
10.199.190.110
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31313000
10.199.190.114
10.199.190.114
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31313400
10.199.190.117
10.199.190.117
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31313700
10.199.190.121
10.199.190.121
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31323100
10.199.190.138
10.199.190.138
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31333800
10.199.190.144
10.199.190.144
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31302e3139392e3139302e31343400
10.199.190.153
10.199.190.153
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31302e3139392e3139302e31353300
10.199.190.156
10.199.190.156
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31353600
10.199.190.157
10.199.190.157
2014/8/5 10:07
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31302e3139392e3139302e31353700
10.199.190.163
10.199.190.163
2014/8/5 10:07
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31302e3139392e3139302e31363300
10.199.190.165
10.199.190.165
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31302e3139392e3139302e31363500
10.199.190.168
10.199.190.168
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31363800
10.199.190.169
10.199.190.169
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31363900
10.199.190.174
10.199.190.174
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31373400
10.199.190.177
10.199.190.177
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31373700
10.199.190.184
10.199.190.184
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31383400
10.199.190.188
10.199.190.188
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31383800
10.199.190.189
10.199.190.189
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31383900
10.199.190.192
10.199.190.192
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31393200
10.199.190.197
10.199.190.197
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e31393700
10.199.190.201
10.199.190.201
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32303100
10.199.190.202
10.199.190.202
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32303200
10.199.190.209
10.199.190.209
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32303900
10.199.190.210
10.199.190.210
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32313000
10.199.190.211
10.199.190.211
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32313100
10.199.190.212
10.199.190.212
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32313200
10.199.190.213
10.199.190.213
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32313300
10.199.190.216
10.199.190.216
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32313600
10.199.190.219
10.199.190.219
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32313900
10.199.190.222
10.199.190.222
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32323200
10.199.190.225
10.199.190.225
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32323500
10.199.190.226
10.199.190.226
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32323600
10.199.190.229
10.199.190.229
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32323900
10.199.190.233
10.199.190.233
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32333300
10.199.190.235
10.199.190.235
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32333500
10.199.190.238
10.199.190.238
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32333800
10.199.190.240
10.199.190.240
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32343000
10.199.190.242
10.199.190.242
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32343200
10.199.190.243
10.199.190.243
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32343300
10.199.190.246
10.199.190.246
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32343600
10.199.190.249
10.199.190.249
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32343900
10.199.190.251
10.199.190.251
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32353100
10.199.190.252
10.199.190.252
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32353200
10.199.190.255
10.199.190.255
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139302e32353500
10.199.191.1
10.199.191.1
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e3100
10.199.191.2
10.199.191.2
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e3200
10.199.191.5
10.199.191.5
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e3500
10.199.191.6
10.199.191.6
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e3600
10.199.191.8
10.199.191.8
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e3800
10.199.191.13
10.199.191.13
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e313300
10.199.191.14
10.199.191.14
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e313400
10.199.191.15
10.199.191.15
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e313500
10.199.191.16
10.199.191.16
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e313600
10.199.191.17
10.199.191.17
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e313700
10.199.191.18
10.199.191.18
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e313800
10.199.191.19
10.199.191.19
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e313900
10.199.191.20
10.199.191.20
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e323000
10.199.191.21
10.199.191.21
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e323100
10.199.191.22
10.199.191.22
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e323200
10.199.191.23
10.199.191.23
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e323300
10.199.191.24
10.199.191.24
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e323400
10.199.191.27
10.199.191.27
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e323700
10.199.191.29
10.199.191.29
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e323900
10.199.191.30
10.199.191.30
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e333000
10.199.191.31
10.199.191.31
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e333100
10.199.191.32
10.199.191.32
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e333200
10.199.191.33
10.199.191.33
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e333300
10.199.191.34
10.199.191.34
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e333400
10.199.191.37
10.199.191.37
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e333700
10.199.191.38
10.199.191.38
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e333800
10.199.191.39
10.199.191.39
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e333900
10.199.191.42
10.199.191.42
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e343200
10.199.191.44
10.199.191.44
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e343400
10.199.191.49
10.199.191.49
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e343900
10.199.191.52
10.199.191.52
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e353200
10.199.191.54
10.199.191.54
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e353400
10.199.191.56
10.199.191.56
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e353600
10.199.191.61
10.199.191.61
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e363100
10.199.191.62
10.199.191.62
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e363200
10.199.191.64
10.199.191.64
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e363400
10.199.191.65
10.199.191.65
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e363500
10.199.191.66
10.199.191.66
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e363600
10.199.191.70
10.199.191.70
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e373000
10.199.191.72
10.199.191.72
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e373200
10.199.191.73
10.199.191.73
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e373300
10.199.191.79
10.199.191.79
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e373900
10.199.191.80
10.199.191.80
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e383000
10.199.191.81
10.199.191.81
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e383100
10.199.191.82
10.199.191.82
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e383200
10.199.191.83
10.199.191.83
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e383300
10.199.191.84
10.199.191.84
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e383400
10.199.191.86
10.199.191.86
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e383600
10.199.191.90
10.199.191.90
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e393000
10.199.191.91
10.199.191.91
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e393100
10.199.191.92
10.199.191.92
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e393200
10.199.191.93
10.199.191.93
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e393300
10.199.191.97
10.199.191.97
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e393700
10.199.191.98
10.199.191.98
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e393800
10.199.191.99
10.199.191.99
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e393900
10.199.191.101
10.199.191.101
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31303100
10.199.191.102
10.199.191.102
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31303200
10.199.191.105
10.199.191.105
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31303500
10.199.191.106
10.199.191.106
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31303600
10.199.191.108
10.199.191.108
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31303800
10.199.191.112
10.199.191.112
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31313200
10.199.191.115
10.199.191.115
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31313500
10.199.191.116
10.199.191.116
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31313600
10.199.191.117
10.199.191.117
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31313700
10.199.191.119
10.199.191.119
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31313900
10.199.191.120
10.199.191.120
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31323000
10.199.191.121
10.199.191.121
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31323100
10.199.191.125
10.199.191.125
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31323500
10.199.191.133
10.199.191.133
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31333300
10.199.191.146
10.199.191.146
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31343600
10.199.191.158
10.199.191.158
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31353800
10.199.191.162
10.199.191.162
2014/8/5 10:07
DHCP/BOOTP
31302e3139392e3139312e31363200Hi,
According your description, this may be caused by virus or malicious client.
Please try to perform a network capture on your DHCP server. Then find the device which send these malicious discover messages.
To download Network Monitor, please click the link below,
http://www.microsoft.com/en-hk/download/details.aspx?id=4865
To prevent this issue, you may implement NAP Enforcement for DHCP.
Here is a checklist of configuring NAP Enforcement for DHCP,
Checklist: Configure NAP Enforcement for DHCP
http://technet.microsoft.com/en-us/library/cc772356(v=WS.10).aspx
Hope this helps.
Steven Lee
TechNet Community Support -
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