Packet received (From client)
======================
No. Time Source SPort
Destination Protocol DPort Length Info
DSCP
1 2017-01-06 08:52:49.662142 192.168.206.83 50001
192.168.206.65 SCTP 3868 98 INIT
CS0
Frame 1: 98 bytes on wire (784 bits), 98 bytes captured (784 bits)
Encapsulation type: Ethernet (1)
Arrival Time: Jan 6, 2017 16:52:49.662142000 Malay Peninsula Standard Time
[Time shift for this packet: 0.000000000 seconds]
Epoch Time: 1483692769.662142000 seconds
[Time delta from previous captured frame: 0.000000000 seconds]
[Time delta from previous displayed frame: 0.000000000 seconds]
[Time since reference or first frame: 0.000000000 seconds]
Frame Number: 1
Frame Length: 98 bytes (784 bits)
Capture Length: 98 bytes (784 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ethertype:ip:sctp]
Ethernet II, Src: RealtekU_54:81:87 (52:54:00:54:81:87), Dst:
Vmware_81:41:6b (00:50:56:81:41:6b)
Destination: Vmware_81:41:6b (00:50:56:81:41:6b)
Address: Vmware_81:41:6b (00:50:56:81:41:6b)
.... ..0. .... .... .... .... = LG bit: Globally unique
address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Source: RealtekU_54:81:87 (52:54:00:54:81:87)
Address: RealtekU_54:81:87 (52:54:00:54:81:87)
.... ..1. .... .... .... .... = LG bit: Locally administered
address (this is NOT the factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 192.168.206.83, Dst: 192.168.206.65
0100 .... = Version: 4
.... 0101 = Header Length: 20 bytes (5)
Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))
0000 00.. = Differentiated Services Codepoint: Default (0)
.... ..10 = Explicit Congestion Notification: ECN-Capable
Transport codepoint '10' (2)
Total Length: 84
Identification: 0x0000 (0)
Flags: 0x02 (Don't Fragment)
0... .... = Reserved bit: Not set
.1.. .... = Don't fragment: Set
..0. .... = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: SCTP (132)
Header checksum: 0x1c3e [validation disabled]
[Good: False]
[Bad: False]
Source: 192.168.206.83
Destination: 192.168.206.65
[Source GeoIP: Unknown]
[Destination GeoIP: Unknown]
Stream Control Transmission Protocol, Src Port: 50001 (50001), Dst
Port: 3868 (3868)
Source port: 50001
Destination port: 3868
Verification tag: 0x00000000
[Assocation index: 0]
Checksum: 0xbaea49e5 (not verified)
INIT chunk (Outbound streams: 3000, inbound streams: 3000)
Chunk type: INIT (1)
0... .... = Bit: Stop processing of the packet
.0.. .... = Bit: Do not report
Chunk flags: 0x00
Chunk length: 52
Initiate tag: 0xe79f40cb
Advertised receiver window credit (a_rwnd): 62464
Number of outbound streams: 3000
Number of inbound streams: 3000
Initial TSN: 176990880
IPv4 address parameter (Address: 192.168.206.83)
Parameter type: IPv4 address (0x0005)
0... .... .... .... = Bit: Stop processing of chunk
.0.. .... .... .... = Bit: Do not report
Parameter length: 8
IP Version 4 address: 192.168.206.83
IPv4 address parameter (Address: 192.168.1.83)
Parameter type: IPv4 address (0x0005)
0... .... .... .... = Bit: Stop processing of chunk
.0.. .... .... .... = Bit: Do not report
Parameter length: 8
IP Version 4 address: 192.168.1.83
Supported address types parameter (Supported types: IPv6, IPv4)
Parameter type: Supported address types (0x000c)
0... .... .... .... = Bit: Stop processing of chunk
.0.. .... .... .... = Bit: Do not report
Parameter length: 8
Supported address type: IPv6 address (6)
Supported address type: IPv4 address (5)
ECN parameter
Parameter type: ECN (0x8000)
1... .... .... .... = Bit: Skip parameter and continue
processing of the chunk
.0.. .... .... .... = Bit: Do not report
Parameter length: 4
Forward TSN supported parameter
Parameter type: Forward TSN supported (0xc000)
1... .... .... .... = Bit: Skip parameter and continue
processing of the chunk
.1.. .... .... .... = Bit: Do report
Parameter length: 4
On Tue, Jan 10, 2017 at 3:18 AM, Neil Horman <nhorman@xxxxxxxxxxxxx> wrote:
> On Tue, Jan 10, 2017 at 12:31:01AM +0800, Sun Paul wrote:
>> what kind of information do you need? the whole INIT packet?
>>
> That would be ideal.
>
>> On Mon, Jan 9, 2017 at 8:25 PM, Neil Horman <nhorman@xxxxxxxxxxxxx> wrote:
>> > On Mon, Jan 09, 2017 at 06:00:36PM +0800, Sun Paul wrote:
>> >> Hi
>> >>
>> >> the linux router just change the destination, so it can arrive on the
>> >> the SERVER.
>> >>
>> > Please post the relevant snippets from the client and server tcpdump
>> > operations
>> >
>> > Neil
>> >
>> >> On Mon, Jan 9, 2017 at 5:51 PM, David Laight <David.Laight@xxxxxxxxxx> wrote:
>> >> > From: Sun Paul
>> >> >> Sent: 09 January 2017 02:08
>> >> >
>> >> >> >> I am setting up a lab where the SCTP traffics from client is passing
>> >> >> >> through a linux router before reaching to the SCTP server running
>> >> >> >> LKSCTP.
>> >> >> >>
>> >> >> >> The linux router did not change the source address of the client, so
>> >> >> >> when it arrived to the SCTP server, the source address is the oriingal
>> >> >> >> one.
>> >> >>
>> >> >> the INIT chunk arrive on the SERVER, but then no response. the
>> >> >> application that using in SERVER is the same as the other test.
>> >> >>
>> >> >> I noticed one thing in Ethernet frame of the incoming packet on the
>> >> >> SERVER compared to the one captured from the client is the LG bit on
>> >> >> the source address.
>> >> >>
>> >> >> The LG bit is set to 0 on the request packet received in the
>> >> >> SERVER,but it is 0 from the one originated on the client. willl it be
>> >> >> the root cause?
>> >> >
>> >> > Which addresses are you talking about, and what do you mean by the LG bit?
>> >> >
>> >> > Is your linux 'router' just routing (ie IP forwarding) or is it doing NAT?
>> >> > If it is changing the IP addresses then the addresses inside some SCTP
>> >> > chunks also need changing.
>> >> >
>> >> > David
>> >> >
>> >>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-sctp" in
>> the body of a message to majordomo@xxxxxxxxxxxxxxx
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
--
To unsubscribe from this list: send the line "unsubscribe linux-sctp" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
