port based routing

[jerry.mcrae]

i installed a new t1 to the Internet at a remote location. now email traffic to the Internet (yahoo, google) from the remote site is using the new interface. i need to redirect port 25 traffic up to my office then out to the Internet from here.

any ideas?

thanks in advance.

[karthikmani]

Hi Jerry,

How about using route maps? Match port 25 and change the next hop to your location. let me know if this helps.

Thanks,

Karthik Mani.

[jackyoung]

Check below for policy-base routing info. & sample. However, you also need to have proper routing config. at your office for the return traffic.

http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a00800c75d2.html

Hope this helps.

[jerry.mcrae]

jack - i already have this policy map and i think i read you can only have one policy map per interface. is that true?

policy-map ABC_SP

class voice-traffic

priority 800

class voice-signaling

bandwidth 8

class class-default

fair-queue

this is what i plan on using;

access-list 104 permit tcp 172.19.0.0 0.0.255.255 eq 25

access-list 104 permit tcp 10.10.160.0 0.0.0.255 eq 25

access-list 104 permit tcp 10.10.161.0 0.0.0.255 eq 25

route-map smtp1 permit 10

match ip address 104

set ip next hop 172.17.1.5

this is the current interface config;

interface Serial0/2/0

description

bandwidth 1544

ip unnumbered GigabitEthernet0/0.10

no cdp enable

service-policy output ABC_SP

[devang_etcom]

yes you do have only single policy map per interface...

regards

Devang

[jerry.mcrae]

ok thanks for the info. whats the difference b/t route map and policy map?

i am going to apply this route map to the interface connected to the ISP so the one policy per interface shouldnt aplly to me - correct? do i even need to apply the map below to an interface?

access-list 104 permit tcp 172.19.0.0 0.0.255.255 eq 25

access-list 104 permit tcp 10.10.160.0 0.0.0.255 eq 25

access-list 104 permit tcp 10.10.161.0 0.0.0.255 eq 25

route-map smtp1 permit 10

match ip address 104

set ip next hop 172.17.1.5

[jackyoung]

Yes, only one policy map per interface. The route-map is used to identify the matching list of the address and set the next step for the matched traffic.

We use route-map to define the policy and apply it to the interface w/ "policy-map" command. So you can set different condidtion in route-map but apply it at a time to the interface.

According to your config., it is correct, you only need to add the "policy-map" command at the interface. Check the link that I provided for the format.

If you have multiple conditions, you can use below syntex :

route-map smtp1 permit 10

match xxx

set ....

route-map smtp1 permit 20

match yyy

set ...

The line no. 10 & 20 is used to set the sequence of each condition. If line 10 map not matched, it will continute to scan the route-map w/ 20.

Hope this helps.