Mailing List Archive

JUNOS doesn't send an MRU. According to the PPP RFC if a host doesn't
receive an MRU from their peer they should fall back to the minimum MTU for
the link, IOS doesn't which is why you'll be able to 'negotiate' 4470 across
POS. I've heard this is going to be fixed in a future JUNOS release.
b

-----Original Message-----
From: David Liang [mailto:davidliang02@hotmail.com]
Sent: February 4, 2003 8:55 PM
To: juniper-nsp@puck.nether.net
Subject: [j-nsp] ppp lcp mru problem


Hi, All

From the debugging info for ppp negotiation between Juniper/IOS, I didn't
see the MRU info from Juniper side. Just wondering if it's a problem?

Thks!

Juniper <----------------------------> IOS
so-0/2/0:172.16.0.1 Pos2/0:172.16.0.2

*Feb 3 08:13:38.038 UTC: PO2/0 LCP: O CONFREQ [REQsent] id 14 len 14
*Feb 3 08:13:38.038 UTC: PO2/0 LCP: MRU 4470 (0x01041176)
*Feb 3 08:13:38.038 UTC: PO2/0 LCP: MagicNumber 0xEF59EB40
(0x0506EF59EB40)
*Feb 3 08:13:40.002 UTC: PO2/0 LCP: I CONFREQ [REQsent] id 1 len 10
*Feb 3 08:13:40.002 UTC: PO2/0 LCP: MagicNumber 0x3E3E5C82
(0x05063E3E5C82) <============== MRU missing here?
*Feb 3 08:13:40.002 UTC: PO2/0 LCP: O CONFACK [REQsent] id 1 len 10
*Feb 3 08:13:40.002 UTC: PO2/0 LCP: MagicNumber 0x3E3E5C82
(0x05063E3E5C82)
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: TIMEout: State ACKsent
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: O CONFREQ [ACKsent] id 15 len 14
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: MRU 4470 (0x01041176)
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: MagicNumber 0xEF59EB40
(0x0506EF59EB40)
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: I CONFACK [ACKsent] id 15 len 14
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: MRU 4470 (0x01041176)
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: MagicNumber 0xEF59EB40
(0x0506EF59EB40)
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: State is Open
*Feb 3 08:13:40.038 UTC: PO2/0 PPP: Phase is UP





_________________________________________________________________
STOP MORE SPAM with the new MSN 8 and get 2 months FREE*
http://join.msn.com/?page=features/junkmail

_______________________________________________
juniper-nsp mailing list juniper-nsp@puck.nether.net
http://puck.nether.net/mailman/listinfo/juniper-nsp
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://puck.nether.net/pipermail/juniper-nsp/attachments/20030205/a0c3eefd/attachment.htm

Hi, All

From the ppp lcp negotiation between ios and juniper, I found the there's no
mru sent from juniper side? It's a problem with Juniper's ppp?

Thks!

David

Juniper <----------------------------> IOS
so-0/2/0:172.16.0.1 Pos2/0:172.16.0.2

*Feb 3 08:13:38.038 UTC: PO2/0 LCP: O CONFREQ [REQsent] id 14 len 14
*Feb 3 08:13:38.038 UTC: PO2/0 LCP: MRU 4470 (0x01041176)
*Feb 3 08:13:38.038 UTC: PO2/0 LCP: MagicNumber 0xEF59EB40
(0x0506EF59EB40)
*Feb 3 08:13:40.002 UTC: PO2/0 LCP: I CONFREQ [REQsent] id 1 len 10
*Feb 3 08:13:40.002 UTC: PO2/0 LCP: MagicNumber 0x3E3E5C82
(0x05063E3E5C82) <========== missing the MRU?

*Feb 3 08:13:40.002 UTC: PO2/0 LCP: O CONFACK [REQsent] id 1 len 10
*Feb 3 08:13:40.002 UTC: PO2/0 LCP: MagicNumber 0x3E3E5C82
(0x05063E3E5C82)
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: TIMEout: State ACKsent
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: O CONFREQ [ACKsent] id 15 len 14
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: MRU 4470 (0x01041176)
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: MagicNumber 0xEF59EB40
(0x0506EF59EB40)
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: I CONFACK [ACKsent] id 15 len 14
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: MRU 4470 (0x01041176)
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: MagicNumber 0xEF59EB40
(0x0506EF59EB40)
*Feb 3 08:13:40.038 UTC: PO2/0 LCP: State is Open
*Feb 3 08:13:40.038 UTC: PO2/0 PPP: Phase is UP





_________________________________________________________________
The new MSN 8: smart spam protection and 2 months FREE*
http://join.msn.com/?page=features/junkmail