I am installing a brand new Cisco ASA 5545-X with IPS and for some reason, even after a "configure factory-default", one of the interfaces (Gi0/6) is generating DHCP Discover packets.
I have already checked all the other interfaces and only Gi0/6 has this behavior. Keep in mind that the switch interfaces have the same config for all the firewall ports (like the one below). Does anyone have idea of what is happening on this firewall to generate this traffic even with no specific config?
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Some traffic captured from this firewall
19:23:34.540527 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from e4:c7:22:f3:35:68, length 548
19:23:34.540549 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from e4:c7:22:f3:35:68, length 548
19:23:34.540572 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from e4:c7:22:f3:35:68, length 548
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SWITCH INTERFACES FOLLOW THIS TEMPLATE...
interface eth1/1
switchport access vlan 10
speed 1000
duplex full
=============================================
ciscoasa# sh ver
Cisco Adaptive Security Appliance Software Version 9.1(2)8
Device Manager Version 7.1(5)
Compiled on Fri 30-Aug-13 15:13 PDT by builders
System image file is "disk0:/asa912-8-smp-k8.bin"
Config file at boot was "startup-config"
ciscoasa up 33 mins 39 secs
Hardware: ASA5545, 12288 MB RAM, CPU Lynnfield 2660 MHz, 1 CPU (8 cores)
ASA: 6144 MB RAM, 1 CPU (1 core)
Internal ATA Compact Flash, 8192MB
BIOS Flash MX25L6445E @ 0xffbb0000, 8192KB
Encryption hardware device : Cisco ASA-55xx on-board accelerator (revision 0x1)
Boot microcode : CNPx-MC-BOOT-2.00
SSL/IKE microcode : CNPx-MC-SSL-PLUS-T020
IPSec microcode : CNPx-MC-IPSEC-MAIN-0025
Number of accelerators: 1
Baseboard Management Controller (revision 0x1) Firmware Version: 2.4
0: Int: Internal-Data0/0 : address is e4c7.22f3.355f, irq 11
1: Ext: GigabitEthernet0/0 : address is e4c7.22f3.3564, irq 5
2: Ext: GigabitEthernet0/1 : address is e4c7.22f3.3560, irq 5
3: Ext: GigabitEthernet0/2 : address is e4c7.22f3.3565, irq 10
4: Ext: GigabitEthernet0/3 : address is e4c7.22f3.3561, irq 10
5: Ext: GigabitEthernet0/4 : address is e4c7.22f3.3566, irq 5
6: Ext: GigabitEthernet0/5 : address is e4c7.22f3.3562, irq 5
7: Ext: GigabitEthernet0/6 : address is e4c7.22f3.3567, irq 10
8: Ext: GigabitEthernet0/7 : address is e4c7.22f3.3563, irq 10
9: Int: Internal-Data0/1 : address is 0000.0001.0002, irq 0
10: Int: Internal-Control0/0 : address is 0000.0001.0001, irq 0
11: Int: Internal-Data0/2 : address is 0000.0001.0003, irq 0
12: Ext: Management0/0 : address is e4c7.22f3.355f, irq 0
Licensed features for this platform:
Maximum Physical Interfaces : Unlimited perpetual
Maximum VLANs : 300 perpetual
Inside Hosts : Unlimited perpetual
Failover : Active/Active perpetual
Encryption-DES : Enabled perpetual
Encryption-3DES-AES : Enabled perpetual
Security Contexts : 2 perpetual
GTP/GPRS : Disabled perpetual
AnyConnect Premium Peers : 2 perpetual
AnyConnect Essentials : Disabled perpetual
Other VPN Peers : 2500 perpetual
Total VPN Peers : 2500 perpetual
Shared License : Disabled perpetual
AnyConnect for Mobile : Disabled perpetual
AnyConnect for Cisco VPN Phone : Disabled perpetual
Advanced Endpoint Assessment : Disabled perpetual
UC Phone Proxy Sessions : 2 perpetual
Total UC Proxy Sessions : 2 perpetual
Botnet Traffic Filter : Disabled perpetual
Intercompany Media Engine : Disabled perpetual
IPS Module : Enabled perpetual
Cluster : Disabled perpetual
This platform has an ASA5545 VPN Premium license.
Serial Number: xxxxxxxxxx
Running Permanent Activation Key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Configuration register is 0x1
Configuration last modified by enable_15 at 11:15:20.849 UTC Thu Jan 16 2014
ciscoasa#
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ciscoasa# sh module
Mod Card Type Model Serial No.
---- -------------------------------------------- ------------------ -----------
0 ASA 5545-X with SW, 8 GE Data, 1 GE Mgmt ASA5545 FCH17387H07
ips ASA 5545-X IPS Security Services Processor ASA5545-IPS FCH17387H07
cxsc Unknown N/A FCH17387H07
Mod MAC Address Range Hw Version Fw Version Sw Version
---- --------------------------------- ------------ ------------ ---------------
0 e4c7.22f3.355f to e4c7.22f3.3568 1.0 2.1(9)8 9.1(2)8
ips e4c7.22f3.355d to e4c7.22f3.355d N/A N/A 7.1(8)E4
cxsc e4c7.22f3.355d to e4c7.22f3.355d N/A N/A
Mod SSM Application Name Status SSM Application Version
---- ------------------------------ ---------------- --------------------------
ips IPS Up 7.1(8)E4
cxsc Unknown No Image Present Not Applicable
Mod Status Data Plane Status Compatibility
---- ------------------ --------------------- -------------
0 Up Sys Not Applicable
ips Up Up
cxsc Unresponsive Not Applicable
Mod License Name License Status Time Remaining
---- -------------- --------------- ---------------
ips IPS Module Enabled perpetual
ciscoasa#
=============================================
ciscoasa# sh run
: Saved
:
ASA Version 9.1(2)8
!
hostname ciscoasa
enable password 8Ry2YjIyt7RRXU24 encrypted
names
!
interface GigabitEthernet0/0
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/1
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/2
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/3
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/4
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/5
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/6
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/7
no nameif
no security-level
no ip address
!
interface Management0/0
management-only
nameif management
security-level 100
ip address 192.168.1.1 255.255.255.0
!
ftp mode passive
pager lines 24
logging asdm informational
mtu management 1500
no failover
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
no arp permit-nonconnected
timeout xlate 3:00:00
timeout pat-xlate 0:00:30
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
dynamic-access-policy-record DfltAccessPolicy
user-identity default-domain LOCAL
http server enable
http server idle-timeout 5
http server session-timeout 5
http 192.168.1.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart warmstart
crypto ipsec security-association pmtu-aging infinite
crypto ca trustpool policy
telnet timeout 5
ssh timeout 5
ssh key-exchange group dh-group1-sha1
console timeout 0
dhcpd address 192.168.1.2-192.168.1.254 management
dhcpd enable management
!
dhcprelay timeout 60
!
tls-proxy maximum-session 1000
!
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
parameters
message-length maximum client auto
message-length maximum 512
policy-map global_policy
class inspection_default
inspect dns preset_dns_map
inspect ftp
inspect h323 h225
inspect h323 ras
inspect rsh
inspect rtsp
inspect esmtp
inspect sqlnet
inspect skinny
inspect sunrpc
inspect xdmcp
inspect sip
inspect netbios
inspect tftp
inspect ip-options
!
service-policy global_policy global
prompt hostname context
no call-home reporting anonymous
Cryptochecksum:d41d8cd98f00b204e9800998ecf8427e
: end
ciscoasa#
=============================================
ciscoasa# sh int | i line|packets
Interface GigabitEthernet0/0 "", is up, line protocol is up
0 packets input, 0 bytes, 0 no buffer
0 packets output, 0 bytes, 0 underruns
Interface GigabitEthernet0/1 "", is up, line protocol is up
0 packets input, 0 bytes, 0 no buffer
0 packets output, 0 bytes, 0 underruns
Interface GigabitEthernet0/2 "", is up, line protocol is up
0 packets input, 0 bytes, 0 no buffer
0 packets output, 0 bytes, 0 underruns
Interface GigabitEthernet0/3 "", is up, line protocol is up
0 packets input, 0 bytes, 0 no buffer
0 packets output, 0 bytes, 0 underruns
Interface GigabitEthernet0/4 "", is up, line protocol is up
0 packets input, 0 bytes, 0 no buffer
0 packets output, 0 bytes, 0 underruns
Interface GigabitEthernet0/5 "", is up, line protocol is up
0 packets input, 0 bytes, 0 no buffer
0 packets output, 0 bytes, 0 underruns
Interface GigabitEthernet0/6 "", is up, line protocol is up
2 packets input, 128 bytes, 0 no buffer
87 packets output, 51678 bytes, 0 underruns
Interface GigabitEthernet0/7 "", is up, line protocol is up
0 packets input, 0 bytes, 0 no buffer
0 packets output, 0 bytes, 0 underruns
Interface Management0/0 "management", is down, line protocol is down
0 packets input, 0 bytes, 0 no buffer
1 packets output, 42 bytes, 0 underruns
0 packets input, 0 bytes
1 packets output, 28 bytes
0 packets dropped
Management-only interface. Blocked 0 through-the-device packets
ciscoasa#
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