[bug] GRE tunnels don't work from pre6 and up (testing pre7 series)

From: David Ford (david@kalifornia.com)
Date: Thu May 18 2000 - 18:00:04 EST


GRE tunnels appear to have broken somewhere in pre7-x.

According to iptables logs, the packets exit the output chain on device
gre1 but are lost between there and actually hitting the wire.

These two packets are ICMP echo replies.

May 18 15:54:28 james kernel:
    IN= OUT=gre1
    SRC=208.179.0.2 DST=208.179.0.198
    LEN=84 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=ICMP TYPE=0 CODE=0
ID=43535 SEQ=51041
May 18 15:54:29 james kernel:
    IN= OUT=gre1
    SRC=208.179.0.2 DST=208.179.0.198
    LEN=84 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=ICMP TYPE=0 CODE=0
ID=43535 SEQ=51297

# ip tu s gre1
gre1: gre/ip remote 24.30.182.109 local 208.179.0.6 ttl 127

# ip a s gre1
6: gre1@NONE: <POINTOPOINT,NOARP,UP> mtu 1476 qdisc noqueue
    link/gre 208.179.0.6 peer 24.30.182.109
    inet 192.168.10.3/32 scope global gre1

# ip r s
208.179.0.192/27 dev gre1 scope link src 208.179.0.2
192.168.0.0/23 dev eth0 scope link
default via 208.179.68.72 dev eth0 src 208.179.0.2 onlink

# ip ru s
0: from all lookup local
32766: from all lookup main
32767: from all lookup 253

Still searching for answers..

-d

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