Can't ping local side of GRE tunnel

Discussion in 'Cisco' started by Vsevolod Denisenko, Jul 21, 2004.

  1. Hi, All!

    It looks like a kind of "catch 22".
    There is CISCO 2503 with activated eth0 && serial0.
    There is tun0 with source interface serial0 from 2503 to other
    router 2610. The problem is ping inside 2503 to his local tunnel side when
    encapsulation type is set to GRE IP. After changing encapsulation type to IP
    IP all pings works fine. But I need exactly GRE encapsulation.
    Could you please take a look to my configs and tell me what's wrong?

    my-2503#sh ver
    Cisco Internetwork Operating System Software
    IOS (tm) 2500 Software (C2500-IOS56I-L), Version 12.0(28a), RELEASE SOFTWARE
    Copyright (c) 1986-2004 by cisco Systems, Inc.
    Compiled Wed 21-Apr-04 21:14 by cmong
    Image text-base: 0x035AA584, data-base: 0x00001000

    ROM: System Bootstrap, Version 4.14(9.1), SOFTWARE

    my-2503 uptime is 19 hours, 15 minutes
    System restarted by reload
    System image file is "flash:c2500-ios56i-l.120-28a.bin"

    cisco 2500 (68030) processor (revision D) with 16384K/2048K bytes of memory.
    Processor board ID 01723534, with hardware revision 00000000
    Bridging software.
    X.25 software, Version 3.0.0.
    Basic Rate ISDN software, Version 1.1.
    1 Ethernet/IEEE 802.3 interface(s)
    2 Serial network interface(s)
    1 ISDN Basic Rate interface(s)
    32K bytes of non-volatile configuration memory.
    16384K bytes of processor board System flash (Read ONLY)

    Configuration register is 0x2102


    ip subnet-zero
    interface Tunnel0
    interface Ethernet0
    interface Serial0

    ip classless
    ip route x.y.z.81
    ip route Tunnel0

    access-list 101 permit gre host x.y.z.82 host a.b.c.18
    access-list 101 permit ip any any
    access-list 101 permit icmp any any

    This is pings result from 2503 to it's own tunnel address
    with activated GRE IP encapsulation type


    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:
    Success rate is 0 percent (0/5)

    This is ping's result when IPIP encapsulation is active:

    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:
    Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
    Vsevolod Denisenko, Jul 21, 2004
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