01-24-2012 08:49 AM - edited 03-11-2019 03:18 PM
Hi,
We are having some issues with our Cisco ASA 5505 unit, it intermittently drops the outside interface connection. Internally the network appears to be working correctly with no issues. Even though the outside interface indicates it is 'up' access to the internet is lost from our LAN. This seems to be ocourring more and more often! This is happening for all users on the network too. Reloading the ASA seems to correct the problem temporally but this isn't really an option during peak periods in the day as this would obviously hinder work being carried out by employees.
Any ideas?
Any help would be greatly appreciated!!
Thanks,
John
Running Config Below:
---------------------------------
ASA Version 8.2(1)
!
hostname ******************
domain-name *************************
enable password ************************* encrypted
passwd **************************** encrypted
names
dns-guard
!
interface Vlan1
nameif inside
security-level 100
ip address 10.3.0.254 255.255.0.0
!
interface Vlan2
nameif outside
security-level 0
ip address ***************** 255.255.255.248
!
interface Ethernet0/0
switchport access vlan 2
!
interface Ethernet0/1
!
interface Ethernet0/2
!
interface Ethernet0/3
!
interface Ethernet0/4
!
interface Ethernet0/5
!
interface Ethernet0/6
!
interface Ethernet0/7
!
ftp mode passive
dns domain-lookup inside
dns domain-lookup outside
dns server-group DefaultDNS
name-server *****************
domain-name **********************
same-security-traffic permit inter-interface
same-security-traffic permit intra-interface
access-list outside_access_in extended permit tcp any any eq smtp
access-list outside_access_in extended permit tcp any any eq 3389
access-list outside_access_in extended permit tcp any any eq https
access-list outside_access_in extended permit tcp any any
access-list outside_access_in extended permit tcp any any eq 3839
pager lines 24
logging enable
logging asdm warnings
mtu inside 1500
mtu outside 1500
failover timeout -1
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-621.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0
static (inside,outside) tcp interface smtp 10.3.0.2 smtp netmask 255.255.255.255
static (inside,outside) tcp interface https 10.3.0.2 https netmask 255.255.255.255
static (inside,outside) tcp interface 3839 10.3.0.1 3839 netmask 255.255.255.255
static (inside,outside) tcp interface 3389 10.3.0.1 3389 netmask 255.255.255.255
static (inside,inside) 10.3.0.0 10.3.0.0 netmask 255.255.0.0 norandomseq nailed
static (inside,inside) 172.16.63.0 172.16.63.0 netmask 255.255.255.240 norandomseq nailed
access-group outside_access_in in interface outside
route outside 0.0.0.0 0.0.0.0 *************** 1
route inside 172.16.63.0 255.255.255.240 10.3.0.253 1
timeout xlate 3:00:00
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
dynamic-access-policy-record DfltAccessPolicy
http server enable
http 10.3.0.0 255.255.0.0 inside
http 10.3.0.0 255.255.255.0 inside
http 10.10.2.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
sysopt noproxyarp inside
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
crypto isakmp enable outside
crypto isakmp policy 10
authentication pre-share
encryption 3des
hash md5
group 1
lifetime 86400
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd auto_config outside
!
threat-detection basic-threat
threat-detection statistics port
threat-detection statistics protocol
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
webvpn
username ************ password *********************** encrypted privilege 15
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
parameters
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
!
service-policy global_policy global
01-30-2012 06:27 AM
Hello,
What happens when you assign eth0 as internal interface and eth1 as outside if?
Also configure logging (/debugging) to see if there are hardware issues or something else.
And it seems you have a range of public addresses. What happens when you connect a device, e.g. a laptop directly on the internet access device and send continue ping to an internet host.
When you loose internet connectivity, is the laptop still pinging to that host?
Hopefully this helps you,
Kind regards,
Ralph Willemsen
Arnhem, Netherlands
01-30-2012 11:32 AM
Can you provide:
Sh interface ethernet 0/0
Regards,
Julio
01-30-2012 11:45 AM
Also check the interface duplex settings. If it is set to auto, force it to full. I faced similar issue with my ASA and found the duplex issue.
02-09-2012 02:01 AM
Hi John,
How many inside users/hosts have you got ?
Because, Inside concurrent Hosts are limited depending of your SA licences and options.
You can check that limit insing the following command "sho ver | inc Inside Hosts"
If I remenber well, the control is based on nat translation rules, in order to verify if it's your root cause issue, you can try to do a "clear xlate" the next time problem occurs in order to clear the translation table of the ASA.
Vincent
01-10-2013 06:53 AM
Hi John
Ive had a similar problem. The issue turned out to be what Vincent states above but clear conn worked rather than clear xlate.
do a show ver and see what licence you have and how many inside hosts are supported.
enable logging. not sure what level but I have enabled buffer logging level info and can see Deny traffic from x.x.x.x to x.x.x.x host limit of 10 exceeded.
You might need the 25 user licence
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