Connectivilty problems with PIX 501

Posted on 2007-04-06
Medium Priority
Last Modified: 2010-04-09
I installed a PIX 501 for a remote office. The PIX is connected to a Motorola cable modem and has been assigned a static IP to its outside interface. The connection to the internet will intermittently go down and stay down. While the connection is down the PIX can't ping to the gateway but can ping to internal hosts. A clear ARP command will restore connectivity. I have checked the ARP table while the connection is functioning and when it is down and there are no changes. Power cycling the cable modem has no effect but power cycling the PIX will restore connectivity. Any ideas? The configuration is below.

PIX Version 6.3(5)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password
hostname Sample
domain-name Sample.com
fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
access-list inside permit ip any any
access-list outside permit icmp any any
access-list 100 permit ip
access-list 100 permit icmp
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside Sample
ip address inside
ip audit info action alarm
ip audit attack action alarm
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list 100
nat (inside) 1 0 0
access-group outside in interface outside
access-group inside in interface inside
route outside 1
timeout xlate 0:05:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout sip-disconnect 0:02:00 sip-invite 0:03:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server TACACS+ max-failed-attempts 3
aaa-server TACACS+ deadtime 10
aaa-server RADIUS protocol radius
aaa-server RADIUS max-failed-attempts 3
aaa-server RADIUS deadtime 10
aaa-server LOCAL protocol local
http server enable
http inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
crypto ipsec transform-set strong esp-3des esp-sha-hmac
crypto map tomesa 10 ipsec-isakmp
crypto map tomesa 10 match address 100
crypto map tomesa 10 set peer Sample
crypto map tomesa 10 set transform-set strong
crypto map tomesa interface outside
isakmp enable outside
isakmp key ******** address Sample netmask
isakmp policy 9 authentication pre-share
isakmp policy 9 encryption 3des
isakmp policy 9 hash sha
isakmp policy 9 group 1
isakmp policy 9 lifetime 86400
telnet inside
telnet timeout 5
ssh outside
ssh inside
ssh timeout 15
console timeout 0
dhcpd address inside
dhcpd dns Sample
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd enable inside
terminal width 80

Question by:mikegaston3127
LVL 79

Expert Comment

ID: 18867148
One thing, you can remove the acl on the inside interface
 >access-group inside in interface inside

Your acl permit ip any any is redundant to the default behavior.

You can also try disabling proxyarp on the outside interface since you don't have any static nat entries:
  sysopt noproxyarp outside

Sounds like someone else in your broadcast domain on the cable link also has a firewall that is is trying to proxy your whole outside IP subnet.. You might want to call the cable ISP and let them know so maybe they can help troubleshoot.

Author Comment

ID: 18941032
Problem traced to ISP. After two weks and 5 techs telling me it was my equipment they discoverd they had assigned the same static ip to two people. Nice..........

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