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Message-ID: <561E1DE8.6070400@huawei.com> Date: Wed, 14 Oct 2015 17:18:32 +0800 From: Sheng Yong <shengyong1@...wei.com> To: Li RongQing <roy.qing.li@...il.com>, netdev <netdev@...r.kernel.org> CC: <kafai@...com> Subject: Re: ICMPv6 too big Packet will makes the network unreachable Hi, Rongqing, Cced Martin KaFai Lau <kafai@...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@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > . > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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