[c-nsp] PPPoE multiple sessions issue

[Frank Bulk - iName.com]

At least they aren't duplicate IPs and the routing table seems to be correct
give the situation.

There is a "ppp ipcp unique username" command that you can assign to the
Virtual Template, but a Cisco TAC person told me not to use that, as its use
is not as the description would seem.  Apparently that command was for
situations from several years ago, not for restricting two usernames at the
same time.  We ended up using RADIUS to limit the number of connections to
1.

Frank

-----Original Message-----
From: D.J. O'Berry [mailto:doberry at zcorum.com] 
Sent: Monday, October 26, 2009 3:23 PM
To: frnkblk at iname.com
Cc: 'Cisco-nsp'
Subject: Re: [c-nsp] PPPoE multiple sessions issue

Hi,

Thanks for responding. As you may have noticed, I tried lowering the 
keepalive in the previous email I sent in. However, while I was out 
today the issue came back. I was able to catch the tail end of it though.

The user had an ip assigned via dhcp on each interface. I could not ping 
the older entry (it was the timeout entry obviously) but could the newer 
entry. A show ip route for each ip showed a route entry for the 
corresponding interface.  That's as far as I got though before the 
keep-alive killed the old entry and the user was able to browse again.

I tried setting a limit of one on the vc with the line sessions per-vc 
limit 1, but it did not help. Is there a way on the router to limit the 
number of sessions by username to 1? (I'd rather do this on the router 
as my radius attribute knowledge is slim)

Frank Bulk wrote:
> Do both PPPoE sessions have an IP address associated with them?  If you
look
> at the route table, both from an IP and a Virtual-Access perspective, are
> there duplicate or missing entries from any perspective?
>
> We ended up opening a TAC case for a somewhat similar issue centered
around
> the use of an external DHCP server and faulty "day zero" PPP state
> situation.  The bug was resolved in 12.2(33)SB16.  
>
> Frank
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of D.J. O'Berry
> Sent: Friday, October 23, 2009 11:28 AM
> To: 'Cisco-nsp'
> Subject: [c-nsp] PPPoE multiple sessions issue
>
> Hello all,
>
> I have an issue where random users will apparently lose their pppoe 
> connection on their end for some reason, and reconnect again. The 
> reconnect goes well, but the user cannot browse.  Doing a show user | 
> inc username will list 2 pppoe sessions for the user. Obviously one of 
> these is the lost session. We have a keepalive set, so after the 
> keepalive time passes, the old session of course disappears. The problem 
> is, until that happens or we remove the old session, the user cannot 
> browse at all. Any ideas on causes of this would be much appreciated.
>
> Thanks in advance.
>
>   

-- 
D.J. O'Berry
Network Design Engineer
ZCorum
866-467-9791 ext 7041
doberry at zcorum.com