Conference kali::dewbr

1289.0. "X.25 PVC tunnel over IP" by BRADEC::BALOGH (Gabriel Balogh @BRC) Wed Apr 02 1997 07:17

Hello!

        We have trouble with PVC tunnel over IP. The configuration is the same
as in topic 775.0. i.e.:

________________
/X.25 network A/
---------------
        \       ______________              ________________
        /       / IP network /              / X.25 network B/
    PVC \      --------------              -----------------
        |      /            \             /pvc
       /      /              \           /
   DECbrouter90 A             DECbrouter90 B
        |                       |
+-------+--------+         +----+------+
LAN                         LAN


        In some circumstances, when Serial interface to IP network
of DECbrouter B goes down after coming up the TCP port of tunnel
at DECbrouter A stay up and DECbrouter90 B tunnel sending the error message

-------------------------------------------------------------------------------
-
%X25-3-PVCBAD: Interface Serial1, PVC 1, dest. PVC config. mismatch
-------------------------------------------------------------------------------
-

DECbrouter90 A :


-------------------------------------------------------------------------------
-
Stand-alone TCP connection from host 10.11.102.2
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Local host: 10.2.1.202, Local port: 1998
Foreign host: 10.11.102.2, Foreign port: 11076

Enqueued packets for retransmit: 0, input: 0, saved: 0

Event Timers (current time is 1078538416):
Timer:       Retrans   TimeWait    AckHold    SendWnd  KeepAlive
Starts:          617          0        353          0          0
Wakeups:           4          0          0          0          0
Next:              0          0          0          0          0

iss:  983358988  snduna:  983410226  sndnxt:  983410226     sndwnd:   8148
irs: 4040971217  rcvnxt: 4040979314  rcvwnd:       7665  delrcvwnd:    527

SRTT: 320 ms, RTTO: 837 ms, RTV: 98 ms, KRTT: 0 ms
minRTT: 232 ms, maxRTT: 3528 ms, ACK hold: 300 ms
Flags: passive open, retransmission timeout, fast close

Datagrams (max data segment is 1450 bytes):
Rcvd: 5253 (out of order: 0), with data: 353, total data bytes: 8096
Sent: 5248 (retransmit: 4), with data: 618, total data bytes: 51237

brcr02#show x25 vc 12
 PVC, LCI: 12,  State: D1,  Interface: Serial0
 Started 1w5d, last input 3:27:57, output 3:27:57
 Tunneled PVC to [10.11.2.201] Serial1 PVC 1, connected
 via TCP connection from 10.2.1.202, 1998 to 10.11.102.2, 11076, D-bit allowed
 Window size input: 2, output: 2
 Packet size input: 128, output: 128
 PS: 7  PR: 2  ACK: 2  Remote PR: 7  RCNT: 0  RNR: FALSE
 Retransmits: 0  Timer (secs): 0  Reassembly (bytes): 0
 Held Fragments/Packets: 0/0
 Bytes 95166/682218 Packets 2961/6478 Resets 34/10 RNRs 0/0 REJs 0/0 INTs 0/0

-------------------------------------------------------------------------------
-

There is one known possibility to renew the PVC tunnel to take once
more the config commands on DECbrouter90 A

Q: How I can I eliminate this manual intervention to renew PVC tunnel ?

Q: I set up TCP keepalive timer. It would be a solution?


                                Thank!
			
					Gabriel