[c-nsp] Why doesn't this IPv6 ACL work?

Alexander Clouter alex at digriz.org.uk
Tue Jun 22 03:28:09 EDT 2010


Seth Mattinen <sethm at rollernet.us> wrote:
>
> I tried changing the prefix to be out of my old /48 instead as a shot in
> the dark, and it didn't throw an error at me with this entry:
> 
> permit tcp any host 2620:0:950:1:2c0:f0ff:fe5a:abe8 eq 25
> 
> However, this continues to not work:
> 
> permit tcp any host 2607:fe70:0:1:2c0:f0ff:fe5a:abe8 eq 25
> 
> I can try switching to "routing" instead of "default" template.
> Otherwise I guess it's iptables/ip6tables time for me if this thing
> won't accept host addresses under my /32.
>
Just to really be a pain, it all seems fine on our 3750 stack:
----
103-1#show sdm prefer | include --useful-stuff
 The current template is "desktop IPv4 and IPv6 routing" template.

103-1#show ver | include --useful-stuff
Switch Ports Model              SW Version            SW Image                 
------ ----- -----              ----------            ----------               
*    1 52    WS-C3750-48TS      12.2(53)SE1           C3750-IPSERVICESK9-M     
     2 52    WS-C3750-48TS      12.2(53)SE1           C3750-IPSERVICESK9-M     

103-1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
103-1(config)#ipv6 access-list test
103-1(config-ipv6-acl)#permit tcp any host 2620:0:950:1:2c0:f0ff:fe5a:abe8 eq 25                                                                                      
103-1(config-ipv6-acl)#permit tcp any host 2607:fe70:0:1:2c0:f0ff:fe5a:abe8 eq 25                                                                                     
103-1(config-ipv6-acl)#end
----

There seems to be no interesting difference between 53SE1 and 53SE2[1].  
Last time I had something 'strange'[2] to resolve when talking to Cisco, 
they suggested a "have you tried turning it off and on"...given that a 
whirl? :)

Cheers

[1] http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_53_se/release/notes/OL21141.html#wp1036822
[2] the switch was acting like a hub for particular combination of
	destination MAC

-- 
Alexander Clouter
.sigmonster says: BOFH excuse #254:
                  Interference from lunar radiation



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