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Can't ping local side of GRE tunnel

Vsevolod Denisenko
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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

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