topic Windows 7 cannot browse internet from inside network when Cisco 506e Pix is gateway in Network Security

Windows 7 cannot browse internet from inside network when Cisco 506e Pix is gateway

Charles.Reese — Mon, 11 Mar 2019 21:38:08 GMT

We have a network set up as:

Internet ---> Cisco Router 2600 ---> Cisco Pix 506e ---> Cisco 3550 ---> Windows Clients

Currently all PCs are either Windows XP 32 bit or Windows 2003 Server 32 bit on an IPv4 network. We are migrating to Windows 7 32 bit on the clients. For some reason Windows 7 refuses to connect to the internet. Windows XP can browse the internet, so connectivity is working fine. Windows 7 is a default install, no special settings, no firewall (Disabled), no antimalware/antivirus software.

IPv4 addresses are assigned from a Windows 2003 DHCP server, which provides a 10.x.x.x/24 address, gateway, mask and DNS server settings.

Windows 7 can see all internal devices and can browse local inside web sites.

I cannot see any issues. Any ideas?

Windows 7 cannot browse internet from inside network when Cisco

lcaruso — Fri, 14 Oct 2011 20:55:22 GMT

maybe Win7's protocol stack has ipv6 bound ahead of ipv4.

ipconfig /all shows the addresses assigned to a workstation. If the ipv6 address shows up higher in the list, it is bound first. Try disabling ipv6.

Re: Windows 7 cannot browse internet from inside network when Ci

Charles.Reese — Fri, 14 Oct 2011 21:05:53 GMT

Actually IPv6 is disabled.

all other adapters are disabled too. No WiFi, no virtual adapters (Bonjour, etc.)

Windows 7 cannot browse internet from inside network when Cisco

lcaruso — Fri, 14 Oct 2011 21:10:23 GMT

compare the default gateway setting and default routes on Win7 and compare to XP.

logon to the pix and see if this command works

show asp drops

Re: Windows 7 cannot browse internet from inside network when Ci

Charles.Reese — Fri, 14 Oct 2011 21:57:56 GMT

Windows XP Route Print

-------------------------------------------------------------------------------------------

H:\>route print

===========================================================================

Interface List

0x1 ........................... MS TCP Loopback interface

0x2 ...00 1a a0 6e 7f 14 ...... Intel(R) 82566DM-2 Gigabit Network Connection -

Packet Scheduler Miniport

===========================================================================

Active Routes:

Network Destination Netmask Gateway Interface Metric

0.0.0.0 0.0.0.0 10.0.0.253 10.0.0.98 20

10.0.0.0 255.255.255.0 10.0.0.98 10.0.0.98 20

10.0.0.98 255.255.255.255 127.0.0.1 127.0.0.1 20

10.255.255.255 255.255.255.255 10.0.0.98 10.0.0.98 20

127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1

224.0.0.0 240.0.0.0 10.0.0.98 10.0.0.98 20

255.255.255.255 255.255.255.255 10.0.0.98 10.0.0.98 1

Default Gateway: 10.0.0.253

===========================================================================

Persistent Routes:

None

-------------------------------------------------------------------------------------------

Windows 7 Route Print

-------------------------------------------------------------------------------------------

===========================================================================

Interface List

17...08 11 96 37 ef 5c ......Intel(R) Centrino(R) Advanced-N 6205

14...5c 26 0a 80 3e 4a ......Intel(R) 82579LM Gigabit Network Connection

1...........................Software Loopback Interface 1

13...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter

15...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #2

16...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface

===========================================================================

IPv4 Route Table

===========================================================================

Active Routes:

Network Destination Netmask Gateway Interface Metric

0.0.0.0 0.0.0.0 10.0.0.253 10.0.0.55 276

10.0.0.0 255.255.255.0 On-link 10.0.0.55 276

10.0.0.55 255.255.255.255 On-link 10.0.0.55 276

10.0.0.255 255.255.255.255 On-link 10.0.0.55 276

127.0.0.0 255.0.0.0 On-link 127.0.0.1 306

127.0.0.1 255.255.255.255 On-link 127.0.0.1 306

127.255.255.255 255.255.255.255 On-link 127.0.0.1 306

224.0.0.0 240.0.0.0 On-link 127.0.0.1 306

224.0.0.0 240.0.0.0 On-link 10.0.0.55 276

255.255.255.255 255.255.255.255 On-link 127.0.0.1 306

255.255.255.255 255.255.255.255 On-link 10.0.0.55 276

===========================================================================

Persistent Routes:

Network Address Netmask Gateway Address Metric

0.0.0.0 0.0.0.0 10.0.0.253 Default

===========================================================================

IPv6 Route Table

===========================================================================

Active Routes:

If Metric Network Destination Gateway

1 306 ::1/128 On-link

1 306 ff00::/8 On-link

===========================================================================

Persistent Routes:

None

-------------------------------------------------------------------------------------------

Also "show asp drops" does not work. The PIX is:

Firewall

-------------------------------------------------------------------------------------------

pixf# sh ver

Cisco PIX Firewall Version 6.3(5)

Cisco PIX Device Manager Version 3.0(4)

Compiled on Thu 04-Aug-05 21:40 by morlee

pixf up 2 days 21 hours

Hardware: PIX-506, 32 MB RAM, CPU Pentium 200 MHz

Flash i28F640J5 @ 0x300, 8MB

BIOS Flash AT29C257 @ 0xhhhhhhhh, 32KB

0: ethernet0: address is xxxx.xxxx.xxxx, irq 11

1: ethernet1: address is xxxx.xxxx.xxxx, irq 10

Licensed Features:

Failover: Disabled

VPN-DES: Enabled

VPN-3DES-AES: Enabled

Maximum Physical Interfaces: 2

Maximum Interfaces: 4

Cut-through Proxy: Enabled

Guards: Enabled

URL-filtering: Enabled

Inside Hosts: Unlimited

Throughput: Limited

IKE peers: Unlimited

This PIX has a Restricted (R) license.

Serial Number: nnnnnnnnn (0xhhhhhhhh)

Running Activation Key: 0xhhhhhhhh 0xhhhhhhhh 0xhhhhhhhh 0xhhhhhhhh

Configuration has not been modified since last system restart.

-------------------------------------------------------------------------------------------

Re: Windows 7 cannot browse internet from inside network when Ci

lcaruso — Fri, 14 Oct 2011 22:37:59 GMT

these are all the same

originating inside networks

default route/gateway

dns server

ip protocol

So there's no difference between Win7 clients and XP clients, but the problem states there is a difference. Hmm.

can you ping 8.8.8.8 from XP? Win7?

Re: Windows 7 cannot browse internet from inside network when Ci

Charles.Reese — Fri, 14 Oct 2011 23:47:13 GMT

WindowsXP

ping 8.8.8.8

Pinging 8.8.8.8 with 32 bytes of data:

Request timed out.

Ping statistics for 8.8.8.8:

Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

-------------------------------------------------------------------------------------------

tracert 8.8.8.8

Tracing route to google-public-dns-a.google.com [8.8.8.8]

over a maximum of 30 hops:

1 * * * Request timed out.

2 * * * Request timed out.

3 * * * Request timed out.

4 * * * Request timed out.

5 * * * Request timed out.

6 * * * Request timed out.

7 * * * Request timed out.

8 * * * Request timed out.

9 * * * Request timed out.

10 * * * Request timed out.

11 * * * Request timed out.

12 * * * Request timed out.

13 * * * Request timed out.

14 * * * Request timed out.

15 * * * Request timed out.

16 * * * Request timed out.

17 * * * Request timed out.

18 * * * Request timed out.

19 * * * Request timed out.

20 * * * Request timed out.

21 * * * Request timed out.

22 * * * Request timed out.

23 * * * Request timed out.

24 * * * Request timed out.

25 * * * Request timed out.

26 * * * Request timed out.

27 * * * Request timed out.

28 * * * Request timed out.

29 * * * Request timed out.

30 * * * Request timed out.

Trace complete.

-------------------------------------------------------------------------------------------

Windows 7

ping 8.8.8.8

Pinging 8.8.8.8 with 32 bytes of data:

Reply from 10.0.0.55: Destination host unreachable.

Ping statistics for 8.8.8.8:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

-------------------------------------------------------------------------------------------

tracert 8.8.8.8

Tracing route to google-public-dns-a.google.com [8.8.8.8]

over a maximum of 30 hops:

1 testlaptop.contoso.com [10.0.0.55] reports: Destination host unreachable.

Trace complete.

-------------------------------------------------------------------------------------------

From Windows 2003 Server

-------------------------------------------------------------------------------------------

ping 8.8.8.8

Pinging 8.8.8.8 with 32 bytes of data:

Reply from 8.8.8.8: bytes=32 time=219ms TTL=45

Reply from 8.8.8.8: bytes=32 time=228ms TTL=45

Reply from 8.8.8.8: bytes=32 time=250ms TTL=45

Reply from 8.8.8.8: bytes=32 time=184ms TTL=45

Ping statistics for 8.8.8.8:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 184ms, Maximum = 250ms, Average = 220ms

tracert 8.8.8.8

Tracing route to google-public-dns-a.google.com [8.8.8.8]

over a maximum of 30 hops:

1 2 ms 1 ms 3 ms xxx.xxx.xxx.xxx

2 216 ms 215 ms 72 ms yyy.yyy.yyy.yyy

3 174 ms 176 ms 167 ms 12.81.40.48

4 163 ms 160 ms 168 ms axr01clt-so-1-0-0.bellsouth.net [65.83.239.62]

5 126 ms 128 ms 136 ms 12.81.104.173

6 158 ms 176 ms 184 ms 12.81.46.5

7 16 ms 15 ms 198 ms 12.81.56.8

8 14 ms 14 ms 14 ms 12.81.56.11

9 186 ms 200 ms 191 ms 65.83.238.190

10 43 ms 44 ms 43 ms cr2.rlgnc.ip.att.net [12.123.152.110]

11 185 ms 112 ms 175 ms cr1.wswdc.ip.att.net [12.122.3.170]

12 229 ms 223 ms 157 ms 12.122.113.49

13 61 ms 54 ms 38 ms 12.94.87.18

14 227 ms 224 ms 148 ms 216.239.46.250

15 40 ms 40 ms 40 ms 64.233.175.219

16 203 ms 85 ms 48 ms 72.14.232.25

17 40 ms 40 ms 39 ms google-public-dns-a.google.com [8.8.8.8]

Trace complete.

-------------------------------------------------------------------------------------------

Strange, XP can't get there, Win7 can't get there, but Win2K3 can.

Windows 7 cannot browse internet from inside network when Cisco

cadet alain — Sat, 15 Oct 2011 14:46:11 GMT

Hi,

When you do the pings and traceroute can you also post sh xlate and sh conn from the pix as well sh route.

What is puzling is the persistent route on Win7, can you also do a route delete * on the windows 7 and ipconfig/release and ipconfig/renew and test again to see if there is a difference.

Regards.

Alain.

Windows 7 cannot browse internet from inside network when Cisco

Charles.Reese — Sun, 16 Oct 2011 20:55:10 GMT

Well the XP machine and W2K3 server did add an entry to the xlate table as they should.

sh xlate

Global xxx.xxx.xxx.xxx Local 10.0.0.98

but sh conn did not show any entries for any machine

I executed a "clear" on the pix before running the commands.

The route delete * is a no go. I am diagnosing this remotely and that will sever my access to that machine.

Re: Windows 7 cannot browse internet from inside network when Ci

cadet alain — Mon, 17 Oct 2011 09:43:43 GMT

Hi,

Could you try clearing the arp cache on Windows 7 with arp -d * and try a ping again.

Then verify the arp cache if it doesn't work with arp -a

Regards.

Alain.

Windows 7 cannot browse internet from inside network when Cisco

brian.jones — Mon, 03 Jun 2013 19:05:50 GMT

Did anyone ever find an answer to this?

Windows 7 cannot browse internet from inside network when Cisco

Jouni Forss — Mon, 03 Jun 2013 19:35:22 GMT

I guess the way to go would be to take packet captures on the PIX itself and on the host testing connection to confirm what is happening.

Also monitoring the logs of the PIX firewall should tell something if connections are try not getting through the firewall completely.

We only have a few customers that still use this PIX model but we havent run into any such problem.

- Jouni

Windows 7 cannot browse internet from inside network when Cisco

brian.jones — Mon, 03 Jun 2013 19:42:48 GMT

Thanks for the response. I don't have the exact same model. Running PIX-535 with 6.2(2) code.

Cisco PIX Firewall Version 6.2(2)

Compiled on Fri 07-Jun-02 17:49 by morlee

FW-O1 up 5 days 15 hours

Hardware: PIX-535, 1024 MB RAM, CPU Pentium III 1000 MHz
Flash i28F640J5 @ 0x300, 16MB
BIOS Flash DA28F320J5 @ 0xfffd8000, 128KB

0: gb-ethernet0: address is 0003.470d.6376, irq 255
1: gb-ethernet1: address is 0003.470d.635e, irq 255
2: gb-ethernet2: address is 0003.470d.6360, irq 255
3: gb-ethernet3: address is 0003.470d.6347, irq 12
4: gb-ethernet4: address is 0003.470d.637a, irq 12
5: gb-ethernet5: address is 0003.470d.636f, irq 255
6: gb-ethernet6: address is 0003.47de.6f5e, irq 255
7: gb-ethernet7: address is 0003.47de.7182, irq 12
8: ethernet0: address is 0002.b31b.908f, irq 12
Licensed Features:
Failover:           Enabled
VPN-DES:            Enabled
VPN-3DES:           Disabled
Maximum Interfaces: 10
Cut-through Proxy: Enabled
Guards:             Enabled
URL-filtering:      Enabled
Inside Hosts:       Unlimited
Throughput:         Unlimited
IKE peers:          Unlimited

I don't think I have enough flash to upgraade to 7.0. We are in the process of migrating the PIX to another new firewall but it may be a bit before we do so, so I was looking for options.

The funny thing is, it is only for certain sites. facebook.com and firefox.com are two that everyone complains about. I went to another site today and ran into the same issue. But others such as yahoo.com, cnn.com, etc. works perfectly fine. ICMP works for all sites (unless the site blocks it).

Windows 7 cannot browse internet from inside network when Cisco

Julio Carvajal — Mon, 03 Jun 2013 19:50:38 GMT

Hello Brian,

As Jounni said the way to go is with captures and logs,

My advice: Open a new treath explaining your issue on detail so we can focus on a clean discussion,

Regards

Windows 7 cannot browse internet from inside network when Cisco

Charles.Reese — Tue, 04 Jun 2013 00:49:44 GMT

No answer ever found for the PIX 506e. We just determined it was time to upgrade the firewall anyway. Went with a ASA 5505. As soon as we changed that the systems worked as we expected. I believe it was related to IPv6 but we did have that turned off for the clients.

Basically the time to troubleshoot was going to exceed the price of the ASA. Sometimes a problem is not worth the finding a solution if the solution cannot be afforded for by the client.

Windows 7 cannot browse internet from inside network when Cisco

Julio Carvajal — Tue, 04 Jun 2013 00:52:08 GMT

Okey Charles,

Glad to hear that,

A shame that we never troubleshoot the Pix together but as long as the network is up we are good

Regards