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New Member

SSH Sentinel through pix 506 to Zyxel

Hi all,

I have one PIX 506e, on inside lan there is one PC client, on this client there is SSH Sentinel VPN Client software for connect this PC to a Remote lan protected by Zyxel Router/firewall.

When I activate Sentinel software,

VPN Tunnel goes ON but the taffic doesn't work, for example is not possible to ping any host.

If I remove PIX 506 and I connect PC directly to the Router, VPN Tunnel goes ON and any host of remote Lan respond to Ping. Zyxel support suggest to verify Port 500 and port 68.

New Member

Re: SSH Sentinel through pix 506 to Zyxel

This is configuration on my PIX:

PIX Version 6.3(5)

interface ethernet0 auto

interface ethernet1 auto

nameif ethernet0 outside security0

nameif ethernet1 inside security100

hostname PIX


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 ils 389

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 outside_access_in permit icmp any any echo-reply

access-list nonat permit ip any

access-list nonat permit ip any

access-list nonat permit ip any

pager lines 24

mtu outside 1500

mtu inside 1500

ip address outside xx.xx.xx.xx

ip address inside

ip audit info action alarm

ip audit attack action alarm

ip local pool Networking

ip local pool Mobile

ip local pool Comm

pdm location inside

pdm location outside

pdm history enable

arp timeout 14400

global (outside) 1 interface

nat (inside) 0 access-list nonat

nat (inside) 1 0 0

access-group outside_access_in in interface outside

route outside xx.xx.xx.zz 1

timeout xlate 3:00:00

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

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 TRSET esp-3des esp-sha-hmac

crypto dynamic-map dynmap 10 set transform-set TRSET

crypto map VPN 10 ipsec-isakmp dynamic dynmap

crypto map VPN interface outside

isakmp enable outside

isakmp identity address

isakmp nat-traversal 20

isakmp policy 10 authentication pre-share

isakmp policy 10 encryption 3des

isakmp policy 10 hash sha

isakmp policy 10 group 2

isakmp policy 10 lifetime 86400

vpngroup Networking address-pool ONE

vpngroup Networking dns-server

vpngroup Networking wins-server

vpngroup Networking default-domain intranet

vpngroup Networking idle-time 1800

vpngroup Networking password ZZZZZZZZZZZZZZZZZZZ

vpngroup Mobile address-pool TWO

vpngroup Mobile dns-server

vpngroup Mobile wins-server

vpngroup Mobile default-domain intranet

vpngroup Mobile idle-time 1800

vpngroup Mobile password XXXXXXXXXXXXXXXXXX

vpngroup Comm address-pool THREE

vpngroup Comm dns-server

vpngroup Comm wins-server

vpngroup Comm default-domain intranet

vpngroup Comm idle-time 1800

vpngroup Comm password WWWWWWWWWWW

telnet inside

telnet timeout 5

ssh timeout 5

management-access inside

console timeout 0

terminal width 80

Any idea or solution???

Thanks to all.

New Member

Re: SSH Sentinel through pix 506 to Zyxel


I enable log and find this:

305006: portmap translation creation failed for protocol 50 src inside: dst outside:88.xx.123.zz

Any idea?

New Member

Re: SSH Sentinel through pix 506 to Zyxel

Please help me...


Re: SSH Sentinel through pix 506 to Zyxel

Ensure the vpn client and remote endpoint support nat-traversal. If they do not, you must disable nat-t on your pix and enable fixup protocol esp-ike. This would allow for 1 connection and 1 connection only.

no isakmp nat-traversal

fixup protocol esp-ike

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