01-18-2005 05:03 PM - edited 03-09-2019 10:02 AM
Hi,
I'm using site to site VPN, Branch A has an IP address 192.168.1.0 and Branch B has an IP address 192.168.2.0.
Branch A
access-list 100 permit ip 192.168.1.0 255.255.255.0 192.168.2.0
Branch B
access-list NONAT permit ip 192.168.2.0 255.255.255.0 192.168.1.0 255.255.255.0
Now, How do I only allow Pinging between 192.168.1.0 network and 192.168.2.0 and denied other ICMP?
Thanks
Tonny
01-18-2005 05:56 PM
Hi Tonny,
The IPSEC access lists don't restrict traffic. they are used to signify interesting traffic for the VPN. Create an access list on the inside interfaces of the pix' to restrict traffic as required including ICMP.
Cheers,
Paul.
01-18-2005 06:37 PM
Excellent advice and probably the best answer. BUT, I will throw another idea out there. As Paul mentioned, blocking/permitting the traffic on the inside interface of the PIX is your best bet but I believe you can specify ICMP in the crypto ACL so that only ICMP traffic is tunneled. I know you can do this with L4 information with TCP and UDP traffic, just not sure if it works for other IP protocols.
If you want, make your crypto ACL's look like this:
Branch A
access-list 100 permit icmp 192.168.1.0 255.255.255.0 192.168.2.0 255.255.255.0
Branch B
access-list 100 permit icmp 192.168.2.0 255.255.255.0 192.168.1.0 255.255.255.0
(I may have these addresses wrong so don't go by that - I'm too lazy to look back at the original post).
If this doesn't work, disregard and go with what Paul said.
Later,
Scott
01-19-2005 11:37 PM
Hello,
Wonder why i still can't ping between the 2 network,
should i apply access-list acl_in permit icmp?
here's my basic config:
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password xxxx
passwd xxxx
hostname pix501
domain-name xxx
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
names
access-list NONAT permit ip 192.168.2.0 255.255.255.0 192.168.1.0 255.255.255.0
access-list NONAT permit icmp 192.168.2.0 255.255.255.0 192.168.1.0 255.255.255.
0
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside dhcp setroute
ip address inside 192.168.2.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
pdm history enable
arp timeout 14400
global (outside) 10 interface
nat (inside) 0 access-list NONAT
nat (inside) 10 0.0.0.0 0.0.0.0 0 0
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 uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server RADIUS protocol radius
aaa-server LOCAL protocol local
http server enable
http 192.168.2.2 255.255.255.255 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 kkset esp-3des esp-md5-hmac
crypto map tomiri 10 ipsec-isakmp
crypto map tomiri 10 match address NONAT
crypto map tomiri 10 set peer 218.***.***.***
crypto map tomiri 10 set transform-set kkset
crypto map tomiri interface outside
isakmp enable outside
isakmp key ******** address 218.***.***.*** netmask 255.255.255.255
isakmp identity address
isakmp nat-traversal 20
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption 3des
isakmp policy 10 hash md5
isakmp policy 10 group 2
isakmp policy 10 lifetime 86400
telnet timeout 5
ssh timeout 5
console timeout 0
terminal width 80
thanks
Tonny
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide