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Cisco PIX Router Running Slow

I have a Cisco PIX 510E router brigded to a DSL modem with a static IP.  The internet inside the office is running really slow.  Does anyone have any suggestions as to what settings may cause this?  We tested at the modem and we are getting the full 6MB speed up to that point.
Below are the setting of the router.

: Saved
PIX Version 6.1(4)
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password xxxx encrypted
passwd xxxx encrypted
hostname martin-pix-1
domain-name tl5.net
fixup protocol ftp 21
fixup protocol http 80
fixup protocol h323 1720
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol sip 5060
fixup protocol skinny 2000
pager lines 24
interface ethernet0 auto
interface ethernet1 auto
mtu outside 1500
mtu inside 1500
ip address outside 64.xxx.xxx.3
ip address inside
ip audit info action alarm
ip audit attack action alarm
pdm history enable
arp timeout 14400
global (outside) 1 64.xxx.xxx.4
nat (inside) 1 0 0
route outside 64.xxx.xxx.1 1
route inside 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h323 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
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
no sysopt route dnat
telnet inside
telnet inside
telnet timeout 5
ssh timeout 5
terminal width 80

Password first
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1 Solution
Check your interfaces for errors by logging in to the PIX and typing:
sh interface

It will output your counters for the interfaces and show you of any crcs etc.  Can you upgrade your PIX OS?  Its the oldest one i have ever seen !

Upgrade to 6.3(5) if you have Cisco smartnet or CCO

sorry I have just noticed its a 510 not a 501.  
change your interface speed duplex to match the DSL router
jmkimberlainAuthor Commented:
I mistakenly looked at the wrong router. The one I have is a 506E.  I will check on the interface and software upgrade and see what happens.

Thanks, I'll let you know.
jmkimberlainAuthor Commented:
The OS upgrade fixed my problem.  Thanks!
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