topic Re: port range from outside to inside in Network Security

port range from outside to inside

gary.grobe — Mon, 11 Mar 2019 18:09:07 GMT

For an ASA 5505 and I need to open up a range of ports from 28300 - 28400 and 28600 - 28700, all for access from the outside interface to any machine on the inside interface. Can anyone help out with this?

# sh running-config

: Saved

ASA Version 7.2(4)

hostname ciscoasa

enable password 8HgaP2T2asdbjsx1GBdq encrypted

passwd Ku287h/3Z9f25tj6 encrypted

names

interface Vlan1

nameif inside

security-level 100

ip address 192.168.1.1 255.255.255.0

interface Vlan2

nameif outside

security-level 0

ip address dhcp setroute

interface Ethernet0/0

switchport access vlan 2

interface Ethernet0/1

interface Ethernet0/2

interface Ethernet0/3

interface Ethernet0/4

interface Ethernet0/5

interface Ethernet0/6

interface Ethernet0/7

ftp mode passive

pager lines 24

logging asdm informational

mtu inside 1500

mtu outside 1500

icmp unreachable rate-limit 1 burst-size 1

no asdm history enable

arp timeout 14400

global (outside) 1 interface

nat (inside) 1 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 icmp 0:00:02

timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00

timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00

timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute

http server enable

http 192.168.1.0 255.255.255.0 inside

no snmp-server location

no snmp-server contact

snmp-server enable traps snmp authentication linkup linkdown coldstart

telnet timeout 5

ssh scopy enable

ssh 192.168.1.0 255.255.255.0 inside

ssh timeout 5

console timeout 0

dhcpd auto_config outside

dhcpd address 192.168.1.2-192.168.1.254 inside

dhcpd enable inside

class-map inspection_default

match default-inspection-traffic

policy-map type inspect dns preset_dns_map

parameters

message-length maximum 512

policy-map global_policy

class inspection_default

inspect dns preset_dns_map

inspect ftp

inspect h323 h225

inspect h323 ras

inspect rsh

inspect rtsp

inspect esmtp

inspect sqlnet

inspect skinny

inspect sunrpc

inspect xdmcp

inspect sip

inspect netbios

inspect tftp

service-policy global_policy global

prompt hostname context

Cryptochecksum:9977cf711682d26e5ca49800ac4e94c0

: end

Re: port range from outside to inside

Nagaraja Thanthry — Fri, 09 Jul 2010 03:04:44 GMT

Hello,

Are you doing it for a specific application? I see from your configuration that you are using dynamic PAT. So, there is no point in opening those ports as they will not be mapped to any device. I would suggest you using inspects for opening those ports dynamically (as long as it is one of the standard applications supported by the firewall).

Hope this helps.

Regards,

Re: port range from outside to inside

gary.grobe — Fri, 09 Jul 2010 03:11:04 GMT

Yeah, it's specific for a Matlab application. I will soon add a static IP to the outside interface. It's basically a default config right now.

Re: port range from outside to inside

Nagaraja Thanthry — Fri, 09 Jul 2010 03:31:43 GMT

Hello,

As long as you are assigning public IP to every host that needs the port to be opened, then you can use the following statement:

access-list permit tcp any host range 28300 28400

access-list permit tcp any host range 28600 28700

You need to repeat the above lines for every host.If every inside device has a corresponding public IP and you want it to be open for everybody, then replace the "host public IP" by "any".

Hope this helps.

Regards,