We recently went from a Frame Relay to an Internet based VPN using PIX 501's and Cisco 831's in branch offices. The only annoying problem I cannot seem to figure out is that Telnet sessions to our SCO 5.0.6 server at the head end of the VPN hang up at the client locations. There is no special time frame, sometimes a log in will last all day, but most of the time it will drop out anywhere from 3 minutes to a half an hour on average. I have adjusted system default telnet timeout to 480 minutes on the Unix box, but this won't help because the local subnet Telnet connections never timeout. I have adjusted MTU's inside the tunnels and outside. Cisco thinks it's fragmentation of packets. But all configs we have tried have not made a single improvement. Included is the running config of the PIX at head end:
: Saved
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PIX Version 6.3(1)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password EfgmpnlVN5qxMgKN encrypted
passwd EfgmpnlVN5qxMgKN encrypted
hostname omapix.goodwintucker.local
domain-name goodwintucker.local
clock timezone CST -6
clock summer-time CDT recurring
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol ils 389
fixup protocol pptp 1723
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
no fixup protocol smtp 25
fixup protocol sqlnet 1521
names
access-list 101 permit ip 192.168.0.0 255.255.255.0 192.168.1.0 255.255.255.0
access-list 101 permit ip 192.168.0.0 255.255.255.0 192.168.2.0 255.255.255.0
access-list 101 permit ip 192.168.0.0 255.255.255.0 192.168.3.0 255.255.255.0
access-list 101 permit ip 192.168.0.0 255.255.255.0 192.168.4.0 255.255.255.0
access-list 101 permit gre any any
access-list 101 permit tcp any host X.X.X.X eq smtp
access-list 101 permit tcp any host X.X.X.X eq www
access-list 101 permit tcp any host X.X.X.X eq pptp
access-list 102 permit ip 192.168.0.0 255.255.255.0 192.168.1.0 255.255.255.0
access-list 102 permit ip 192.168.0.0 255.255.255.0 192.168.2.0 255.255.255.0
access-list 102 permit ip 192.168.0.0 255.255.255.0 192.168.3.0 255.255.255.0
access-list 102 permit ip 192.168.0.0 255.255.255.0 192.168.4.0 255.255.255.0
access-list 103 permit ip 192.168.0.0 255.255.255.0 192.168.1.0 255.255.255.0
access-list 103 permit ip 192.168.0.0 255.255.255.0 192.168.2.0 255.255.255.0
access-list 103 permit ip 192.168.0.0 255.255.255.0 192.168.3.0 255.255.255.0
access-list 103 permit ip 192.168.0.0 255.255.255.0 192.168.4.0 255.255.255.0
pager lines 24
logging on
logging trap notifications
logging facility 23
logging host inside 192.168.0.50
mtu outside 1450
mtu inside 1450
ip address outside X.X.X.X 255.255.255.248
ip address inside 192.168.0.4 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip audit signature 1000 disable
ip audit signature 2000 disable
pdm location 192.168.1.0 255.255.255.0 outside
pdm location 192.168.2.0 255.255.255.0 outside
pdm location 192.168.3.0 255.255.255.0 outside
pdm location 192.168.4.0 255.255.255.0 outside
pdm location 0.0.0.50 255.255.255.255 inside
pdm location 192.168.0.51 255.255.255.255 inside
pdm location 192.168.0.50 255.255.255.255 inside
pdm location 192.168.0.2 255.255.255.255 inside
pdm location 192.168.0.8 255.255.255.255 inside
pdm location 192.168.0.0 255.255.255.0 outside
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list 103
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
static (inside,outside) tcp X.X.X.X 255.255.
255.255 0 0
static (inside,outside) tcp X.X.X.X smtp 192.168.0.2 smtp netmask 255.25
5.255.255 0 0
static (inside,outside) tcp X.X.X.X pptp 192.168.0.8 pptp netmask 255.25
5.255.255 0 0
access-group 101 in interface outside
route outside 0.0.0.0 0.0.0.0 Y.Y.Y.Y 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 uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server RADIUS protocol radius
aaa-server LOCAL protocol local
http server enable
http 192.168.0.0 255.255.255.0 inside
snmp-server host inside 192.168.0.50
no snmp-server location
no snmp-server contact
snmp-server community <public>
snmp-server enable traps
tftp-server inside 192.168.0.50 255.255.255.0
floodguard enable
fragment chain 1
sysopt connection tcpmss 1250
sysopt connection permit-ipsec
crypto ipsec transform-set myset1 esp-des esp-md5-hmac
crypto dynamic-map dynmap 10 set transform-set myset1
crypto map mymap 10 ipsec-isakmp dynamic dynmap
crypto map mymap interface outside
isakmp enable outside
isakmp identity address
isakmp keepalive 10
isakmp policy 5 authentication pre-share
isakmp policy 5 encryption des
isakmp policy 5 hash md5
isakmp policy 5 group 2
isakmp policy 5 lifetime 86400
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption aes
isakmp policy 10 hash md5
isakmp policy 10 group 2
isakmp policy 10 lifetime 86400
vpngroup mygroup dns-server 192.168.0.8
vpngroup mygroup wins-server 192.168.0.8
vpngroup mygroup default-domain goodwintucker.local
vpngroup mygroup split-tunnel 102
vpngroup mygroup idle-time 86400
vpngroup mygroup password ********
telnet 0.0.0.50 255.255.255.255 inside
telnet 192.168.0.0 255.255.255.0 inside
telnet timeout 60
ssh 0.0.0.0 0.0.0.0 outside
ssh timeout 5
console timeout 0
dhcpd dns W.W.W.W Z.Z.Z.Z
terminal width 80
Cryptochecksum:238640cf7e468feb37186c57532ec1cc
: end
: Saved
:
PIX Version 6.3(1)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password EfgmpnlVN5qxMgKN encrypted
passwd EfgmpnlVN5qxMgKN encrypted
hostname omapix.goodwintucker.local
domain-name goodwintucker.local
clock timezone CST -6
clock summer-time CDT recurring
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol ils 389
fixup protocol pptp 1723
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
no fixup protocol smtp 25
fixup protocol sqlnet 1521
names
access-list 101 permit ip 192.168.0.0 255.255.255.0 192.168.1.0 255.255.255.0
access-list 101 permit ip 192.168.0.0 255.255.255.0 192.168.2.0 255.255.255.0
access-list 101 permit ip 192.168.0.0 255.255.255.0 192.168.3.0 255.255.255.0
access-list 101 permit ip 192.168.0.0 255.255.255.0 192.168.4.0 255.255.255.0
access-list 101 permit gre any any
access-list 101 permit tcp any host X.X.X.X eq smtp
access-list 101 permit tcp any host X.X.X.X eq www
access-list 101 permit tcp any host X.X.X.X eq pptp
access-list 102 permit ip 192.168.0.0 255.255.255.0 192.168.1.0 255.255.255.0
access-list 102 permit ip 192.168.0.0 255.255.255.0 192.168.2.0 255.255.255.0
access-list 102 permit ip 192.168.0.0 255.255.255.0 192.168.3.0 255.255.255.0
access-list 102 permit ip 192.168.0.0 255.255.255.0 192.168.4.0 255.255.255.0
access-list 103 permit ip 192.168.0.0 255.255.255.0 192.168.1.0 255.255.255.0
access-list 103 permit ip 192.168.0.0 255.255.255.0 192.168.2.0 255.255.255.0
access-list 103 permit ip 192.168.0.0 255.255.255.0 192.168.3.0 255.255.255.0
access-list 103 permit ip 192.168.0.0 255.255.255.0 192.168.4.0 255.255.255.0
pager lines 24
logging on
logging trap notifications
logging facility 23
logging host inside 192.168.0.50
mtu outside 1450
mtu inside 1450
ip address outside X.X.X.X 255.255.255.248
ip address inside 192.168.0.4 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip audit signature 1000 disable
ip audit signature 2000 disable
pdm location 192.168.1.0 255.255.255.0 outside
pdm location 192.168.2.0 255.255.255.0 outside
pdm location 192.168.3.0 255.255.255.0 outside
pdm location 192.168.4.0 255.255.255.0 outside
pdm location 0.0.0.50 255.255.255.255 inside
pdm location 192.168.0.51 255.255.255.255 inside
pdm location 192.168.0.50 255.255.255.255 inside
pdm location 192.168.0.2 255.255.255.255 inside
pdm location 192.168.0.8 255.255.255.255 inside
pdm location 192.168.0.0 255.255.255.0 outside
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list 103
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
static (inside,outside) tcp X.X.X.X 255.255.
255.255 0 0
static (inside,outside) tcp X.X.X.X smtp 192.168.0.2 smtp netmask 255.25
5.255.255 0 0
static (inside,outside) tcp X.X.X.X pptp 192.168.0.8 pptp netmask 255.25
5.255.255 0 0
access-group 101 in interface outside
route outside 0.0.0.0 0.0.0.0 Y.Y.Y.Y 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 uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server RADIUS protocol radius
aaa-server LOCAL protocol local
http server enable
http 192.168.0.0 255.255.255.0 inside
snmp-server host inside 192.168.0.50
no snmp-server location
no snmp-server contact
snmp-server community <public>
snmp-server enable traps
tftp-server inside 192.168.0.50 255.255.255.0
floodguard enable
fragment chain 1
sysopt connection tcpmss 1250
sysopt connection permit-ipsec
crypto ipsec transform-set myset1 esp-des esp-md5-hmac
crypto dynamic-map dynmap 10 set transform-set myset1
crypto map mymap 10 ipsec-isakmp dynamic dynmap
crypto map mymap interface outside
isakmp enable outside
isakmp identity address
isakmp keepalive 10
isakmp policy 5 authentication pre-share
isakmp policy 5 encryption des
isakmp policy 5 hash md5
isakmp policy 5 group 2
isakmp policy 5 lifetime 86400
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption aes
isakmp policy 10 hash md5
isakmp policy 10 group 2
isakmp policy 10 lifetime 86400
vpngroup mygroup dns-server 192.168.0.8
vpngroup mygroup wins-server 192.168.0.8
vpngroup mygroup default-domain goodwintucker.local
vpngroup mygroup split-tunnel 102
vpngroup mygroup idle-time 86400
vpngroup mygroup password ********
telnet 0.0.0.50 255.255.255.255 inside
telnet 192.168.0.0 255.255.255.0 inside
telnet timeout 60
ssh 0.0.0.0 0.0.0.0 outside
ssh timeout 5
console timeout 0
dhcpd dns W.W.W.W Z.Z.Z.Z
terminal width 80
Cryptochecksum:238640cf7e468feb37186c57532ec1cc
: end