Date: Thu, 16 Dec 2021 13:30:32 +0300 From: KOT MATPOCKuH <matpockuh@gmail.com> To: Alan Somers <asomers@freebsd.org> Cc: freebsd-stable List <freebsd-stable@freebsd.org> Subject: Re: ping -6 ignores -e parameter Message-ID: <22748b81-2ae8-babd-d07e-752ed15dce58@GMail.Com> In-Reply-To: <CAOtMX2jUey0qA8MTmRzjVmdQJp5-JOBEeLwGtoNvrucdvwcTWQ@mail.gmail.com> References: <CALmdT0WvtUdteHKEw35tkgZyVzKW2ZT1LKmm1W62vQ_ev2QyPg@mail.gmail.com> <CAOtMX2jUey0qA8MTmRzjVmdQJp5-JOBEeLwGtoNvrucdvwcTWQ@mail.gmail.com>
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Hello, Alan!
I'm sorry, I'm forget to add freebsd-stable@ to CC: list.
Yes, I'm using FreeBSD 13:
13.0-STABLE
Today I have a native IPv6 access and my inet6 routing table is:
# netstat -rn6 | grep -v -e lo0
Routing tables
Internet6:
Destination Gateway Flags
Netif Expire
default fe80::206:29ff:fee9:32a9%lan0 UG
lan0
fd00:dead:beef:100::/64 link#5 U
lan0
fe80::%lan0/64 link#5 U
lan0
fe80::%bridge0/64 link#6 U
bridge0
This means my default gateway is reachable via lan0.
A node which link-local address fe80::2a0:98ff:fe1d:e270 is reachable
via bridge0:
# ping -c 1 fe80::2a0:98ff:fe1d:e270%bridge0
PING6(56=40+8+8 bytes) fe80::5a9c:fcff:fe10:ff9e%bridge0 -->
fe80::2a0:98ff:fe1d:e270%bridge0
16 bytes from fe80::2a0:98ff:fe1d:e270%bridge0, icmp_seq=0 hlim=64
time=0.804 ms
But ping anyway sends packets via lan0.
Also I tried to configure fd13:dead:beef::2 on bridge0, on corresponding
node I configured fd13:dead:beef::1, and then run a command:
ping -6 -e fd13:dead:beef::1 google.com
In this way ping uses source IP address from bridge0 interface, but
sends via lan0 and to next-hop fe80::206:29ff:fee9:32a9%lan0:
# tcpdump -epni lan0 icmp6
12:33:23.308763 8c:ec:4b:e9:28:23 > 00:06:29:e9:32:a9, ethertype IPv6
(0x86dd), length 70: fd13:dead:beef::2 > 2a00:1450:4010:c1e::8a: ICMP6,
echo request, seq 52, length 16
I'm wrote a simple script to check this problem. I checked this script
on image of VM from freebsd'site which FreeBSD-13.
Please see attached file.
On 15/12/2021 21:32, Alan Somers wrote:
> On Wed, Dec 15, 2021 at 11:16 AM KOT MATPOCKuH <matpockuh@gmail.com> wrote:
>>
>> Hello!
>>
>> In a man page for ping(8) and in it's help output I found option "-e":
>> -e gateway
>> Specifies to use gateway as the next hop to the destination. The
>> gateway must be a neighbor of the sending node.
>>
>> I tried to use this argument, ping ignores this parameter and sends the packet via default gateway.
>> For example I have a tun0 which has ipv6 default gw, and an established bridge0 which has available some LL addresses:
>> Neighbor Linklayer Address Netif Expire S Flags
>> fe80::2a0:98ff:fe1d:e270%bridge0 00:a0:98:1d:e2:70 bridge0 23h56m34s S R
>>
>> I tried to run:
>> ping -6 -e FE80::2A0:98FF:FE1D:E270%bridge0 google.com
>> But the packet was sent via tun0 interface.
>>
>> What is wrong with it?
>>
>> --
>> MATPOCKuH
>
> What version of FreeBSD are you using? There was a major change to
> ping's code in FreeBSD 13. Please show the output of
> 'freebsd-version' and 'netstat -rn'.
> -Alan
>
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