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Cisco ASR zone based firewall TFTP SKINNY issues

We have deployed an ASR with zbf and are having issue with softphones registering.  We have created a class map that matches (any) both protocols tftp and skinny, but we get upd SIS_PREGEN on some of the phones that attempt to register.  We have tested with 2 remote phones which are both on the same layer 3 address space.  One phone will register without issue, the other won't register and never gets the tftp data.

Working example

ASR#show policy-map type inspect zone-pair bank0267_outside sessions | include WORKING IP
         Session 27B6878 (WORKING IP:60196)=>(10.43.233.1:69) tftp SIS_OPEN
         Session 27B68C4 (WORKING IP:53104)=>(10.43.139.1:2000) skinny SIS_OPEN
         Session 27B6910 (10.43.233.1:62025)=>(WORKING IP:60196) udp SIS_OPEN
         Session 27B6878 (10.43.233.1:51173)=>(WORKING IP:60196) udp SIS_OPENING
         Session 27B68C4 (10.43.233.1:65431)=>(WORKING IP:60196) udp SIS_OPENING
         Session 27B6910 (10.43.233.1:63142)=>(WORKING IP:60196) udp SIS_OPENING
         Session 27B695C (10.43.233.1:62964)=>(WORKING IP:60196) udp SIS_OPENING
         Session 27B69A8 (10.43.233.1:55205)=>(WORKING IP:60196) udp SIS_OPENING
         Session 27B69F4 (10.43.233.1:62335)=>(WORKING IP:60196) udp SIS_OPENING
         Session 27B6A40 (10.43.233.1:51322)=>(WORKING IP:60196) udp SIS_OPENING
         Session 27B6A8C (10.43.233.1:63560)=>(WORKING IP:60196) udp SIS_OPENING
         Session 27B6AD8 (10.43.233.1:64109)=>(WORKING IP:60196) udp SIS_OPENING
         Session 27B6B24 (10.43.233.1:63245)=>(WORKING IP:60196) udp SIS_OPENING
         Session 27B6B70 (10.43.233.1:64970)=>(WORKING IP:60196) udp SIS_OPENING
         Session 27B6BBC (10.43.233.1:59400)=>(WORKING IP:60196) udp SIS_OPENING

 

Not working:

ASR#show policy-map type inspect zone-pair bank0267_outside sessions | include Not Working IP
         Session 27B6878 (Not Working IP:64303)=>(10.43.139.1:69) tftp SIS_OPENING
         Session 27B6878 (10.43.139.1:0)=>(Not Working IP:64303) udp SIS_PREGEN

 

Again the 2 softphones are on the same layer 3 network and routing appears to be good, the not working can ssh to the cme without issues.

 

class-map type inspect match-any permit_csi_tftp_to_bank
 match protocol tftp
 match protocol skinny

policy-map type inspect bank0267_outside
 <output omitted>

 class type inspect permit_csi_tftp_to_bank
   inspect 

 

Please advise,

 

Joe

 

 

1 REPLY

Hello Joe, Is that Policy-Map

Hello Joe,

 

Is that Policy-Map only containing that information?

 

I just wanna make sure that the phone that is not able to register actually hits that Class-Map that states the traffic should be encrypted.

 

Have you enabled the ip inspect log drop-pkt feature ?

Regards,

 

Jcarvaja

CCIE 42930, 2xCCNP, JNCIS-SEC

For inmediate support http://iNetworks.cr

Looking for some Networking Assistance? Contact me directly at jcarvaja@laguiadelnetworking.com I will fix your problem ASAP. Cheers, Julio Carvajal Segura http://laguiadelnetworking.com
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