* ICMPv6 too big Packet will makes the network unreachable
@ 2015-10-13 7:09 Li RongQing
2015-10-13 12:04 ` Hannes Frederic Sowa
` (2 more replies)
0 siblings, 3 replies; 8+ messages in thread
From: Li RongQing @ 2015-10-13 7:09 UTC (permalink / raw)
To: netdev
1. Machine with 2001:1b70:82a8:18:650:65:0:2 address, and receive wrong
icmp packets
root@du1:~# ifconfig
eth10.650 Link encap:Ethernet HWaddr 74:c9:9a:a7:e5:88
inet6 addr: fe80::76c9:9aff:fea7:e588/64 Scope:Link
inet6 addr: 2001:1b70:82a8:18:650:65:0:2/80 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1 errors:0 dropped:0 overruns:0 frame:0
TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:104 (104.0 B) TX bytes:934 (934.0 B)
2. ICMPv6 packet is as below.
###[ Ethernet ]###
dst = 74:C9:9A:A7:E5:88
src = ae:4f:44:f2:10:cc
type = 0x86dd
###[ IPv6 ]###
version = 6
tc = 0
fl = 0
plen = None
nh = ICMPv6
hlim = 64
src = 2001:1b70:82a8:18:650:65:0:4
dst = 2001:1b70:82a8:18:650:65:0:2
###[ ICMPv6 Packet Too Big ]###
type = Packet too big
code = 0
cksum = None
mtu = 1280
###[ IPv6 ]###
version = 6
tc = 0
fl = 0
plen = None
nh = ICMPv6
hlim = 255
src = 2001:1b70:82a8:18:650:65:0:2
dst = 2001:1b70:82a8:18:650:65:0:2
###[ ICMPv6 Neighbor Discovery - Neighbor Advertisement ]###
type = Neighbor Advertisement
code = 0
cksum = None
R = 1
S = 0
O = 1
res = 0x0
tgt = 2001:1b70:82a8:18:650:65:0:2
##### Test #####
3. Send ICMPv6 with Scapy to trigger fault.
conf.iface='eth1'
eth = Ether(src='ae:4f:44:f2:10:cc', dst='74:C9:9A:A7:E5:88')
base = IPv6(src='2001:1b70:82a8:18:650:65:0:4',
dst='2001:1b70:82a8:18:650:65:0:2')
ptb = ICMPv6PacketTooBig(type=2)
packet = eth/base/ptb
ptb_payload_na_base = IPv6(src='2001:1b70:82a8:18:650:65:0:2',
dst='2001:1b70:82a8:18:650:65:0:2')
ptb_payload_na = ICMPv6ND_NA(type=136, tgt='2001:1b70:82a8:18:650:65:0:2')
ptb_payload = ptb_payload_na_base/ptb_payload_na
packet = packet/ptb_payload
sendp(packet, iface="eth1.650", count=1)
4. route information will enter the faulty state after Wait 600 seconds,
root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
local 2001:1b70:82a8:18:650:65:0:2 dev lo proto none src
2001:1b70:82a8:18:650:65:0:2 metric 0 expires 7sec mtu 1280
root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
local 2001:1b70:82a8:18:650:65:0:2 dev lo proto none src
2001:1b70:82a8:18:650:65:0:2 metric 0 expires 3sec mtu 1280
root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
2001:1b70:82a8:18:650:65:0:2 dev eth10.650 src
2001:1b70:82a8:18:650:65:0:2 metric 0
cache
root@du1:~#
^ permalink raw reply [flat|nested] 8+ messages in thread* Re: ICMPv6 too big Packet will makes the network unreachable
2015-10-13 7:09 ICMPv6 too big Packet will makes the network unreachable Li RongQing
@ 2015-10-13 12:04 ` Hannes Frederic Sowa
2015-10-13 14:26 ` Hannes Frederic Sowa
2015-10-14 9:18 ` Sheng Yong
2 siblings, 0 replies; 8+ messages in thread
From: Hannes Frederic Sowa @ 2015-10-13 12:04 UTC (permalink / raw)
To: Li RongQing, netdev
Hello
On Tue, Oct 13, 2015, at 09:09, Li RongQing wrote:
> 1. Machine with 2001:1b70:82a8:18:650:65:0:2 address, and receive wrong
> icmp packets
> root@du1:~# ifconfig
> eth10.650 Link encap:Ethernet HWaddr 74:c9:9a:a7:e5:88
> inet6 addr: fe80::76c9:9aff:fea7:e588/64 Scope:Link
> inet6 addr: 2001:1b70:82a8:18:650:65:0:2/80 Scope:Global
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:1 errors:0 dropped:0 overruns:0 frame:0
> TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:104 (104.0 B) TX bytes:934 (934.0 B)
>
> 2. ICMPv6 packet is as below.
>
> ###[ Ethernet ]###
> dst = 74:C9:9A:A7:E5:88
> src = ae:4f:44:f2:10:cc
> type = 0x86dd
> ###[ IPv6 ]###
> version = 6
> tc = 0
> fl = 0
> plen = None
> nh = ICMPv6
> hlim = 64
> src = 2001:1b70:82a8:18:650:65:0:4
> dst = 2001:1b70:82a8:18:650:65:0:2
>
> ###[ ICMPv6 Packet Too Big ]###
> type = Packet too big
> code = 0
> cksum = None
> mtu = 1280
>
> ###[ IPv6 ]###
> version = 6
> tc = 0
> fl = 0
> plen = None
> nh = ICMPv6
> hlim = 255
> src = 2001:1b70:82a8:18:650:65:0:2
> dst = 2001:1b70:82a8:18:650:65:0:2
> ###[ ICMPv6 Neighbor Discovery - Neighbor Advertisement ]###
> type = Neighbor Advertisement
> code = 0
> cksum = None
> R = 1
> S = 0
> O = 1
> res = 0x0
> tgt = 2001:1b70:82a8:18:650:65:0:2
>
> ##### Test #####
>
> 3. Send ICMPv6 with Scapy to trigger fault.
>
> conf.iface='eth1'
> eth = Ether(src='ae:4f:44:f2:10:cc', dst='74:C9:9A:A7:E5:88')
> base = IPv6(src='2001:1b70:82a8:18:650:65:0:4',
> dst='2001:1b70:82a8:18:650:65:0:2')
> ptb = ICMPv6PacketTooBig(type=2)
> packet = eth/base/ptb
> ptb_payload_na_base = IPv6(src='2001:1b70:82a8:18:650:65:0:2',
> dst='2001:1b70:82a8:18:650:65:0:2')
> ptb_payload_na = ICMPv6ND_NA(type=136,
> tgt='2001:1b70:82a8:18:650:65:0:2')
> ptb_payload = ptb_payload_na_base/ptb_payload_na
> packet = packet/ptb_payload
> sendp(packet, iface="eth1.650", count=1)
That is a mess, yes. We should in real life scenarios restrict path mtu
updates to sockets which are bound to the mirrored portion of the packet
which is payload of the icmp payload. :( And not accept source addresses
which are obvious local.
Obviously icmpv6 notify routing engine without checks (how could they)
about the path mtu limitation.
>
> 4. route information will enter the faulty state after Wait 600
> seconds,
>
> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
> local 2001:1b70:82a8:18:650:65:0:2 dev lo proto none src
> 2001:1b70:82a8:18:650:65:0:2 metric 0 expires 7sec mtu 1280
>
> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
> local 2001:1b70:82a8:18:650:65:0:2 dev lo proto none src
> 2001:1b70:82a8:18:650:65:0:2 metric 0 expires 3sec mtu 1280
>
> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
> 2001:1b70:82a8:18:650:65:0:2 dev eth10.650 src
> 2001:1b70:82a8:18:650:65:0:2 metric 0
> cache
> root@du1:~#
Urks, it got promoted to a non-local route after removing thus rendering
a remote DoS possibility. This is bad bad bad.
Thanks for the report!
Hannes
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: ICMPv6 too big Packet will makes the network unreachable
2015-10-13 7:09 ICMPv6 too big Packet will makes the network unreachable Li RongQing
2015-10-13 12:04 ` Hannes Frederic Sowa
@ 2015-10-13 14:26 ` Hannes Frederic Sowa
2015-10-14 6:44 ` Li RongQing
2015-10-14 9:18 ` Sheng Yong
2 siblings, 1 reply; 8+ messages in thread
From: Hannes Frederic Sowa @ 2015-10-13 14:26 UTC (permalink / raw)
To: Li RongQing, netdev
On Tue, Oct 13, 2015, at 09:09, Li RongQing wrote:
> 4. route information will enter the faulty state after Wait 600
> seconds,
>
> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
> local 2001:1b70:82a8:18:650:65:0:2 dev lo proto none src
> 2001:1b70:82a8:18:650:65:0:2 metric 0 expires 7sec mtu 1280
>
> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
> local 2001:1b70:82a8:18:650:65:0:2 dev lo proto none src
> 2001:1b70:82a8:18:650:65:0:2 metric 0 expires 3sec mtu 1280
>
> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
> 2001:1b70:82a8:18:650:65:0:2 dev eth10.650 src
> 2001:1b70:82a8:18:650:65:0:2 metric 0
> cache
> root@du1:~#
Which kernel version did you test this on?
Thanks,
Hannes
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: ICMPv6 too big Packet will makes the network unreachable
2015-10-13 14:26 ` Hannes Frederic Sowa
@ 2015-10-14 6:44 ` Li RongQing
2015-10-14 8:44 ` Hannes Frederic Sowa
0 siblings, 1 reply; 8+ messages in thread
From: Li RongQing @ 2015-10-14 6:44 UTC (permalink / raw)
To: Hannes Frederic Sowa; +Cc: netdev
On Tue, Oct 13, 2015 at 10:26 PM, Hannes Frederic Sowa
<hannes@stressinduktion.org> wrote:
>> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
>> 2001:1b70:82a8:18:650:65:0:2 dev eth10.650 src
>> 2001:1b70:82a8:18:650:65:0:2 metric 0
>> cache
>> root@du1:~#
>
> Which kernel version did you test this on?
>
> Thanks,
> Hannes
I think it is all version
-Roy
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: ICMPv6 too big Packet will makes the network unreachable
2015-10-14 6:44 ` Li RongQing
@ 2015-10-14 8:44 ` Hannes Frederic Sowa
0 siblings, 0 replies; 8+ messages in thread
From: Hannes Frederic Sowa @ 2015-10-14 8:44 UTC (permalink / raw)
To: Li RongQing; +Cc: netdev
On Wed, Oct 14, 2015, at 08:44, Li RongQing wrote:
> On Tue, Oct 13, 2015 at 10:26 PM, Hannes Frederic Sowa
> <hannes@stressinduktion.org> wrote:
> >> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
> >> 2001:1b70:82a8:18:650:65:0:2 dev eth10.650 src
> >> 2001:1b70:82a8:18:650:65:0:2 metric 0
> >> cache
> >> root@du1:~#
> >
> > Which kernel version did you test this on?
> >
> > Thanks,
> > Hannes
>
>
> I think it is all version
I wonder very much because in tests I definitely hit the
static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct
sock *sk,
const struct ipv6hdr *iph, u32 mtu)
{
struct rt6_info *rt6 = (struct rt6_info *)dst;
if (rt6->rt6i_flags & RTF_LOCAL)
return;
RTF_LOCAL check all the times. Which kernel version did you on
specifically?
Thanks,
Hannes
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: ICMPv6 too big Packet will makes the network unreachable
2015-10-13 7:09 ICMPv6 too big Packet will makes the network unreachable Li RongQing
2015-10-13 12:04 ` Hannes Frederic Sowa
2015-10-13 14:26 ` Hannes Frederic Sowa
@ 2015-10-14 9:18 ` Sheng Yong
2015-10-14 9:53 ` Li RongQing
2 siblings, 1 reply; 8+ messages in thread
From: Sheng Yong @ 2015-10-14 9:18 UTC (permalink / raw)
To: Li RongQing, netdev; +Cc: kafai
Hi, Rongqing,
Cced Martin KaFai Lau <kafai@fb.com>
It seems you trigger the problem that I met before, here is the link of disucssion:
http://www.spinics.net/lists/netdev/msg314717.html
You can try these patches to check if they resolve your problem:
7035870d1219 | 2015-05-03 | ipv6: Check RTF_LOCAL on rt->rt6i_flags instead of rt->dst.flags
653437d02f1f | 2015-04-28 | ipv6: Stop /128 route from disappearing after pmtu update
thanks,
Sheng
On 10/13/2015 3:09 PM, Li RongQing wrote:
> 1. Machine with 2001:1b70:82a8:18:650:65:0:2 address, and receive wrong
> icmp packets
> root@du1:~# ifconfig
> eth10.650 Link encap:Ethernet HWaddr 74:c9:9a:a7:e5:88
> inet6 addr: fe80::76c9:9aff:fea7:e588/64 Scope:Link
> inet6 addr: 2001:1b70:82a8:18:650:65:0:2/80 Scope:Global
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:1 errors:0 dropped:0 overruns:0 frame:0
> TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:104 (104.0 B) TX bytes:934 (934.0 B)
>
> 2. ICMPv6 packet is as below.
>
> ###[ Ethernet ]###
> dst = 74:C9:9A:A7:E5:88
> src = ae:4f:44:f2:10:cc
> type = 0x86dd
> ###[ IPv6 ]###
> version = 6
> tc = 0
> fl = 0
> plen = None
> nh = ICMPv6
> hlim = 64
> src = 2001:1b70:82a8:18:650:65:0:4
> dst = 2001:1b70:82a8:18:650:65:0:2
>
> ###[ ICMPv6 Packet Too Big ]###
> type = Packet too big
> code = 0
> cksum = None
> mtu = 1280
>
> ###[ IPv6 ]###
> version = 6
> tc = 0
> fl = 0
> plen = None
> nh = ICMPv6
> hlim = 255
> src = 2001:1b70:82a8:18:650:65:0:2
> dst = 2001:1b70:82a8:18:650:65:0:2
> ###[ ICMPv6 Neighbor Discovery - Neighbor Advertisement ]###
> type = Neighbor Advertisement
> code = 0
> cksum = None
> R = 1
> S = 0
> O = 1
> res = 0x0
> tgt = 2001:1b70:82a8:18:650:65:0:2
>
> ##### Test #####
>
> 3. Send ICMPv6 with Scapy to trigger fault.
>
> conf.iface='eth1'
> eth = Ether(src='ae:4f:44:f2:10:cc', dst='74:C9:9A:A7:E5:88')
> base = IPv6(src='2001:1b70:82a8:18:650:65:0:4',
> dst='2001:1b70:82a8:18:650:65:0:2')
> ptb = ICMPv6PacketTooBig(type=2)
> packet = eth/base/ptb
> ptb_payload_na_base = IPv6(src='2001:1b70:82a8:18:650:65:0:2',
> dst='2001:1b70:82a8:18:650:65:0:2')
> ptb_payload_na = ICMPv6ND_NA(type=136, tgt='2001:1b70:82a8:18:650:65:0:2')
> ptb_payload = ptb_payload_na_base/ptb_payload_na
> packet = packet/ptb_payload
> sendp(packet, iface="eth1.650", count=1)
>
> 4. route information will enter the faulty state after Wait 600 seconds,
>
> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
> local 2001:1b70:82a8:18:650:65:0:2 dev lo proto none src
> 2001:1b70:82a8:18:650:65:0:2 metric 0 expires 7sec mtu 1280
>
> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
> local 2001:1b70:82a8:18:650:65:0:2 dev lo proto none src
> 2001:1b70:82a8:18:650:65:0:2 metric 0 expires 3sec mtu 1280
>
> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
> 2001:1b70:82a8:18:650:65:0:2 dev eth10.650 src
> 2001:1b70:82a8:18:650:65:0:2 metric 0
> cache
> root@du1:~#
> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
> .
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: ICMPv6 too big Packet will makes the network unreachable
2015-10-14 9:18 ` Sheng Yong
@ 2015-10-14 9:53 ` Li RongQing
2015-10-14 10:58 ` Li RongQing
0 siblings, 1 reply; 8+ messages in thread
From: Li RongQing @ 2015-10-14 9:53 UTC (permalink / raw)
To: Sheng Yong; +Cc: netdev, Martin KaFai Lau
On Wed, Oct 14, 2015 at 5:18 PM, Sheng Yong <shengyong1@huawei.com> wrote:
> Hi, Rongqing,
>
> Cced Martin KaFai Lau <kafai@fb.com>
>
> It seems you trigger the problem that I met before, here is the link of disucssion:
> http://www.spinics.net/lists/netdev/msg314717.html
>
> You can try these patches to check if they resolve your problem:
> 7035870d1219 | 2015-05-03 | ipv6: Check RTF_LOCAL on rt->rt6i_flags instead of rt->dst.flags
> 653437d02f1f | 2015-04-28 | ipv6: Stop /128 route from disappearing after pmtu update
>
> thanks,
> Sheng
>
> On 10/13/2015 3:09 PM, Li RongQing wrote:
>> 1. Machine with 2001:1b70:82a8:18:650:65:0:2 address, and receive wrong
>> icmp packets
>> root@du1:~# ifconfig
>> eth10.650 Link encap:Ethernet HWaddr 74:c9:9a:a7:e5:88
>> inet6 addr: fe80::76c9:9aff:fea7:e588/64 Scope:Link
>> inet6 addr: 2001:1b70:82a8:18:650:65:0:2/80 Scope:Global
>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>> RX packets:1 errors:0 dropped:0 overruns:0 frame:0
>> TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
>> collisions:0 txqueuelen:0
>> RX bytes:104 (104.0 B) TX bytes:934 (934.0 B)
>>
>> 2. ICMPv6 packet is as below.
>>
>> ###[ Ethernet ]###
>> dst = 74:C9:9A:A7:E5:88
>> src = ae:4f:44:f2:10:cc
>> type = 0x86dd
>> ###[ IPv6 ]###
>> version = 6
>> tc = 0
>> fl = 0
>> plen = None
>> nh = ICMPv6
>> hlim = 64
>> src = 2001:1b70:82a8:18:650:65:0:4
>> dst = 2001:1b70:82a8:18:650:65:0:2
>>
>> ###[ ICMPv6 Packet Too Big ]###
>> type = Packet too big
>> code = 0
>> cksum = None
>> mtu = 1280
>>
>> ###[ IPv6 ]###
>> version = 6
>> tc = 0
>> fl = 0
>> plen = None
>> nh = ICMPv6
>> hlim = 255
>> src = 2001:1b70:82a8:18:650:65:0:2
>> dst = 2001:1b70:82a8:18:650:65:0:2
>> ###[ ICMPv6 Neighbor Discovery - Neighbor Advertisement ]###
>> type = Neighbor Advertisement
>> code = 0
>> cksum = None
>> R = 1
>> S = 0
>> O = 1
>> res = 0x0
>> tgt = 2001:1b70:82a8:18:650:65:0:2
>>
>> ##### Test #####
>>
>> 3. Send ICMPv6 with Scapy to trigger fault.
>>
>> conf.iface='eth1'
>> eth = Ether(src='ae:4f:44:f2:10:cc', dst='74:C9:9A:A7:E5:88')
>> base = IPv6(src='2001:1b70:82a8:18:650:65:0:4',
>> dst='2001:1b70:82a8:18:650:65:0:2')
>> ptb = ICMPv6PacketTooBig(type=2)
>> packet = eth/base/ptb
>> ptb_payload_na_base = IPv6(src='2001:1b70:82a8:18:650:65:0:2',
>> dst='2001:1b70:82a8:18:650:65:0:2')
>> ptb_payload_na = ICMPv6ND_NA(type=136, tgt='2001:1b70:82a8:18:650:65:0:2')
>> ptb_payload = ptb_payload_na_base/ptb_payload_na
>> packet = packet/ptb_payload
>> sendp(packet, iface="eth1.650", count=1)
>>
>> 4. route information will enter the faulty state after Wait 600 seconds,
>>
>> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
>> local 2001:1b70:82a8:18:650:65:0:2 dev lo proto none src
>> 2001:1b70:82a8:18:650:65:0:2 metric 0 expires 7sec mtu 1280
>>
>> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
>> local 2001:1b70:82a8:18:650:65:0:2 dev lo proto none src
>> 2001:1b70:82a8:18:650:65:0:2 metric 0 expires 3sec mtu 1280
>>
>> root@du1:~# ip route get 2001:1b70:82a8:18:650:65:0:2
>> 2001:1b70:82a8:18:650:65:0:2 dev eth10.650 src
>> 2001:1b70:82a8:18:650:65:0:2 metric 0
>> cache
>> root@du1:~#
>> --
>> To unsubscribe from this list: send the line "unsubscribe netdev" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>> .
>>
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: ICMPv6 too big Packet will makes the network unreachable
2015-10-14 9:53 ` Li RongQing
@ 2015-10-14 10:58 ` Li RongQing
0 siblings, 0 replies; 8+ messages in thread
From: Li RongQing @ 2015-10-14 10:58 UTC (permalink / raw)
To: Sheng Yong; +Cc: netdev, Martin KaFai Lau
On Wed, Oct 14, 2015 at 5:53 PM, Li RongQing <roy.qing.li@gmail.com> wrote:
> On Wed, Oct 14, 2015 at 5:18 PM, Sheng Yong <shengyong1@huawei.com> wrote:
>> Hi, Rongqing,
>>
>> Cced Martin KaFai Lau <kafai@fb.com>
>>
>> It seems you trigger the problem that I met before, here is the link of disucssion:
>> http://www.spinics.net/lists/netdev/msg314717.html
>>
>> You can try these patches to check if they resolve your problem:
>> 7035870d1219 | 2015-05-03 | ipv6: Check RTF_LOCAL on rt->rt6i_flags instead of rt->dst.flags
>> 653437d02f1f | 2015-04-28 | ipv6: Stop /128 route from disappearing after pmtu update
>>
>> thanks,
>> Sheng
>>
You are right, these two commits fixed my issue
Thanks
-Roy
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2015-10-14 10:58 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
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2015-10-13 7:09 ICMPv6 too big Packet will makes the network unreachable Li RongQing
2015-10-13 12:04 ` Hannes Frederic Sowa
2015-10-13 14:26 ` Hannes Frederic Sowa
2015-10-14 6:44 ` Li RongQing
2015-10-14 8:44 ` Hannes Frederic Sowa
2015-10-14 9:18 ` Sheng Yong
2015-10-14 9:53 ` Li RongQing
2015-10-14 10:58 ` Li RongQing
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