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Message-ID: <CANn89iJoMcxe6xAOE=QGfqmOa1p+_ssSr_2y4KUJr-Qap3xk0Q@mail.gmail.com>
Date: Mon, 23 Sep 2024 10:57:34 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Anton Danilov <littlesmilingcloud@...il.com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
David Ahern <dsahern@...nel.org>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Suman Ghosh <sumang@...vell.com>, Shigeru Yoshida <syoshida@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net] ipv4: ip_gre: Fix drops of small packets in ipgre_xmit
On Sun, Sep 22, 2024 at 10:23 PM Anton Danilov
<littlesmilingcloud@...il.com> wrote:
>
> On Sun, Sep 22, 2024 at 12:20:03PM +0200, Eric Dumazet wrote:
>
> Hi Eric,
>
> > Please provide a real selftest, because in this particular example,
> > the path taken by the packets should not reach the
> > pskb_network_may_pull(skb, pull_len)),
> > because dev->header_ops should be NULL ?
>
> I sincerely apologize for providing an inaccurate example of the commands
> needed to reproduce the issue. I understand that this may have caused
> confusion, and I'm truly sorry for any inconvenience.
>
> Here are the correct commands and their results.
>
>
> ip l add name mgre0 type gre local 192.168.71.177 remote 0.0.0.0 ikey 1.9.8.4 okey 1.9.8.4
> ip l s mtu 1400 dev mgre0
> ip a add 192.168.13.1/24 dev mgre0
> ip l s up dev mgre0
> ip n add 192.168.13.2 lladdr 192.168.69.50 dev mgre0
This looks much better. I was hoping that we could capture this in a
new test (added in tools/testing/selftests/net)
Please also move the buggy "tnl_params = (const struct iphdr
*)skb->data;" line as in :
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 5f6fd382af38a32d9e22633cdb2e9fd01f1795e4..f1f31ebfc7934467fd10776c3cb221f9cff9f9dd
100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -662,11 +662,11 @@ static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
if (skb_cow_head(skb, 0))
goto free_skb;
- tnl_params = (const struct iphdr *)skb->data;
-
- if (!pskb_network_may_pull(skb, pull_len))
+ if (!pskb_may_pull(skb, pull_len))
goto free_skb;
+ tnl_params = (const struct iphdr *)skb->data;
+
/* ip_tunnel_xmit() needs skb->data pointing to gre header. */
skb_pull(skb, pull_len);
skb_reset_mac_header(skb);
>
>
> ip -s -s -d l ls dev mgre0
> 19: mgre0@...E: <NOARP,UP,LOWER_UP> mtu 1400 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
> link/gre 192.168.71.177 brd 0.0.0.0 promiscuity 0 allmulti 0 minmtu 0 maxmtu 0
> gre remote any local 192.168.71.177 ttl inherit ikey 1.9.8.4 okey 1.9.8.4 \
> addrgenmode eui64 numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535 \
> tso_max_size 65536 tso_max_segs 65535 gro_max_size 65536
>
> RX: bytes packets errors dropped missed mcast
> 0 0 0 0 0 0
> RX errors: length crc frame fifo overrun
> 0 0 0 0 0
> TX: bytes packets errors dropped carrier collsns
> 0 0 0 0 0 0
> TX errors: aborted fifo window heartbt transns
> 0 0 0 0 0
>
>
> ping -n -c 10 -s 1374 192.168.13.2
> PING 192.168.13.2 (192.168.13.2) 1374(1402) bytes of data.
>
> --- 192.168.13.2 ping statistics ---
> 10 packets transmitted, 0 received, 100% packet loss, time 9237ms
>
>
> ip -s -s -d l ls dev mgre0
> 19: mgre0@...E: <NOARP,UP,LOWER_UP> mtu 1400 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
> link/gre 192.168.71.177 brd 0.0.0.0 promiscuity 1 allmulti 0 minmtu 0 maxmtu 0
> gre remote any local 192.168.71.177 ttl inherit ikey 1.9.8.4 okey 1.9.8.4 \
> addrgenmode eui64 numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535 \
> tso_max_size 65536 tso_max_segs 65535 gro_max_size 65536
>
> RX: bytes packets errors dropped missed mcast
> 0 0 0 0 0 0
> RX errors: length crc frame fifo overrun
> 0 0 0 0 0
> TX: bytes packets errors dropped carrier collsns
> 13960 10 0 10 0 0
> TX errors: aborted fifo window heartbt transns
> 0 0 0 0 0
>
>
> tcpdump -vni mgre0
> tcpdump: listening on mgre0, link-type LINUX_SLL (Linux cooked v1), snapshot length 262144 bytes
> 21:51:19.481523 IP (tos 0x0, ttl 64, id 52595, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 1, length 1376
> 21:51:19.481547 IP (tos 0x0, ttl 64, id 52595, offset 1376, flags [none], proto ICMP (1), length 26)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 21:51:20.526751 IP (tos 0x0, ttl 64, id 53374, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 2, length 1376
> 21:51:20.526773 IP (tos 0x0, ttl 64, id 53374, offset 1376, flags [none], proto ICMP (1), length 26)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 21:51:21.550751 IP (tos 0x0, ttl 64, id 54124, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 3, length 1376
> 21:51:21.550775 IP (tos 0x0, ttl 64, id 54124, offset 1376, flags [none], proto ICMP (1), length 26)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 21:51:22.574748 IP (tos 0x0, ttl 64, id 55109, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 4, length 1376
> 21:51:22.574766 IP (tos 0x0, ttl 64, id 55109, offset 1376, flags [none], proto ICMP (1), length 26)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 21:51:23.598748 IP (tos 0x0, ttl 64, id 56011, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 5, length 1376
> 21:51:23.598771 IP (tos 0x0, ttl 64, id 56011, offset 1376, flags [none], proto ICMP (1), length 26)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 21:51:24.622758 IP (tos 0x0, ttl 64, id 57009, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 6, length 1376
> 21:51:24.622783 IP (tos 0x0, ttl 64, id 57009, offset 1376, flags [none], proto ICMP (1), length 26)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 21:51:25.646748 IP (tos 0x0, ttl 64, id 57277, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 7, length 1376
> 21:51:25.646775 IP (tos 0x0, ttl 64, id 57277, offset 1376, flags [none], proto ICMP (1), length 26)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 21:51:26.670750 IP (tos 0x0, ttl 64, id 57869, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 8, length 1376
> 21:51:26.670773 IP (tos 0x0, ttl 64, id 57869, offset 1376, flags [none], proto ICMP (1), length 26)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 21:51:27.694751 IP (tos 0x0, ttl 64, id 58317, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 9, length 1376
> 21:51:27.694774 IP (tos 0x0, ttl 64, id 58317, offset 1376, flags [none], proto ICMP (1), length 26)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 21:51:28.718751 IP (tos 0x0, ttl 64, id 58558, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 10, length 1376
> 21:51:28.718775 IP (tos 0x0, ttl 64, id 58558, offset 1376, flags [none], proto ICMP (1), length 26)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
>
>
> tcpdump -vni enp11s0.100 'ip proto 47'
> tcpdump: listening on enp11s0.100, link-type EN10MB (Ethernet), snapshot length 262144 bytes
> 21:51:19.481696 IP (tos 0x0, ttl 64, id 32563, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 52595, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 1, length 1376
> 21:51:20.526767 IP (tos 0x0, ttl 64, id 33363, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 53374, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 2, length 1376
> 21:51:21.550768 IP (tos 0x0, ttl 64, id 34260, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 54124, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 3, length 1376
> 21:51:22.574761 IP (tos 0x0, ttl 64, id 34922, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 55109, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 4, length 1376
> 21:51:23.598764 IP (tos 0x0, ttl 64, id 35042, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 56011, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 5, length 1376
> 21:51:24.622775 IP (tos 0x0, ttl 64, id 36024, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 57009, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 6, length 1376
> 21:51:25.646766 IP (tos 0x0, ttl 64, id 36133, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 57277, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 7, length 1376
> 21:51:26.670766 IP (tos 0x0, ttl 64, id 36417, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 57869, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 8, length 1376
> 21:51:27.694767 IP (tos 0x0, ttl 64, id 37006, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 58317, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 9, length 1376
> 21:51:28.718767 IP (tos 0x0, ttl 64, id 37825, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 58558, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 63847, seq 10, length 1376
>
>
> ping -n -c 10 -s 1376 192.168.13.2
> PING 192.168.13.2 (192.168.13.2) 1376(1404) bytes of data.
>
> --- 192.168.13.2 ping statistics ---
> 10 packets transmitted, 0 received, 100% packet loss, time 9198ms
>
>
> ip -s -s -d l ls dev mgre0
> 19: mgre0@...E: <NOARP,UP,LOWER_UP> mtu 1400 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
> link/gre 192.168.71.177 brd 0.0.0.0 promiscuity 0 allmulti 0 minmtu 0 maxmtu 0
> gre remote any local 192.168.71.177 ttl inherit ikey 1.9.8.4 okey 1.9.8.4 addrgenmode eui64 numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535 tso_max_size 65536 tso_max_segs 65535 gro_max_size 65536
> RX: bytes packets errors dropped missed mcast
> 0 0 0 0 0 0
> RX errors: length crc frame fifo overrun
> 0 0 0 0 0
> TX: bytes packets errors dropped carrier collsns
> 28200 30 0 10 0 0
> TX errors: aborted fifo window heartbt transns
> 0 0 0 0 0
>
>
> tcpdump -vni mgre0
> tcpdump: listening on mgre0, link-type LINUX_SLL (Linux cooked v1), snapshot length 262144 bytes
> 22:01:34.176810 IP (tos 0x0, ttl 64, id 40388, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 1, length 1376
> 22:01:34.176830 IP (tos 0x0, ttl 64, id 40388, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:35.183742 IP (tos 0x0, ttl 64, id 40516, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 2, length 1376
> 22:01:35.183765 IP (tos 0x0, ttl 64, id 40516, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:36.207750 IP (tos 0x0, ttl 64, id 40684, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 3, length 1376
> 22:01:36.207774 IP (tos 0x0, ttl 64, id 40684, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:37.230738 IP (tos 0x0, ttl 64, id 41578, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 4, length 1376
> 22:01:37.230756 IP (tos 0x0, ttl 64, id 41578, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:38.254761 IP (tos 0x0, ttl 64, id 42099, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 5, length 1376
> 22:01:38.254789 IP (tos 0x0, ttl 64, id 42099, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:39.278748 IP (tos 0x0, ttl 64, id 42506, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 6, length 1376
> 22:01:39.278771 IP (tos 0x0, ttl 64, id 42506, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:40.302738 IP (tos 0x0, ttl 64, id 42527, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 7, length 1376
> 22:01:40.302754 IP (tos 0x0, ttl 64, id 42527, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:41.326733 IP (tos 0x0, ttl 64, id 42989, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 8, length 1376
> 22:01:41.326749 IP (tos 0x0, ttl 64, id 42989, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:42.350750 IP (tos 0x0, ttl 64, id 43576, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 9, length 1376
> 22:01:42.350773 IP (tos 0x0, ttl 64, id 43576, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:43.374743 IP (tos 0x0, ttl 64, id 44118, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 10, length 1376
> 22:01:43.374762 IP (tos 0x0, ttl 64, id 44118, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
>
>
> tcpdump -vni enp11s0.100 'ip proto 47'
> tcpdump: listening on enp11s0.100, link-type EN10MB (Ethernet), snapshot length 262144 bytes
> 22:01:34.176825 IP (tos 0x0, ttl 64, id 5066, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 40388, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 1, length 1376
> 22:01:34.176832 IP (tos 0x0, ttl 64, id 5067, offset 0, flags [DF], proto GRE (47), length 56)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 36
> IP (tos 0x0, ttl 64, id 40388, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:35.183758 IP (tos 0x0, ttl 64, id 5567, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 40516, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 2, length 1376
> 22:01:35.183768 IP (tos 0x0, ttl 64, id 5568, offset 0, flags [DF], proto GRE (47), length 56)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 36
> IP (tos 0x0, ttl 64, id 40516, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:36.207767 IP (tos 0x0, ttl 64, id 5741, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 40684, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 3, length 1376
> 22:01:36.207778 IP (tos 0x0, ttl 64, id 5742, offset 0, flags [DF], proto GRE (47), length 56)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 36
> IP (tos 0x0, ttl 64, id 40684, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:37.230751 IP (tos 0x0, ttl 64, id 5785, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 41578, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 4, length 1376
> 22:01:37.230758 IP (tos 0x0, ttl 64, id 5786, offset 0, flags [DF], proto GRE (47), length 56)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 36
> IP (tos 0x0, ttl 64, id 41578, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:38.254780 IP (tos 0x0, ttl 64, id 5937, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 42099, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 5, length 1376
> 22:01:38.254795 IP (tos 0x0, ttl 64, id 5938, offset 0, flags [DF], proto GRE (47), length 56)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 36
> IP (tos 0x0, ttl 64, id 42099, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:39.278764 IP (tos 0x0, ttl 64, id 6876, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 42506, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 6, length 1376
> 22:01:39.278775 IP (tos 0x0, ttl 64, id 6877, offset 0, flags [DF], proto GRE (47), length 56)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 36
> IP (tos 0x0, ttl 64, id 42506, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:40.302749 IP (tos 0x0, ttl 64, id 7410, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 42527, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 7, length 1376
> 22:01:40.302757 IP (tos 0x0, ttl 64, id 7411, offset 0, flags [DF], proto GRE (47), length 56)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 36
> IP (tos 0x0, ttl 64, id 42527, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:41.326744 IP (tos 0x0, ttl 64, id 7913, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 42989, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 8, length 1376
> 22:01:41.326753 IP (tos 0x0, ttl 64, id 7914, offset 0, flags [DF], proto GRE (47), length 56)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 36
> IP (tos 0x0, ttl 64, id 42989, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:42.350766 IP (tos 0x0, ttl 64, id 8422, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 43576, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 9, length 1376
> 22:01:42.350776 IP (tos 0x0, ttl 64, id 8423, offset 0, flags [DF], proto GRE (47), length 56)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 36
> IP (tos 0x0, ttl 64, id 43576, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
> 22:01:43.374756 IP (tos 0x0, ttl 64, id 9410, offset 0, flags [DF], proto GRE (47), length 1424)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 1404
> IP (tos 0x0, ttl 64, id 44118, offset 0, flags [+], proto ICMP (1), length 1396)
> 192.168.13.1 > 192.168.13.2: ICMP echo request, id 54476, seq 10, length 1376
> 22:01:43.374766 IP (tos 0x0, ttl 64, id 9411, offset 0, flags [DF], proto GRE (47), length 56)
> 192.168.71.177 > 192.168.69.50: GREv0, Flags [key present], key=0x1090804, length 36
> IP (tos 0x0, ttl 64, id 44118, offset 1376, flags [none], proto ICMP (1), length 28)
> 192.168.13.1 > 192.168.13.2: ip-proto-1
>
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