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Feature #6115
openmodem: MTU not set properly on tun iface
Status:
Feedback
Priority:
Normal
Assignee:
Category:
OsmocomBB modem (host)
Target version:
Start date:
07/26/2023
Due date:
% Done:
0%
Resolution:
Spec Reference:
Description
tested using iperf3 client in the netns + tun created by the "modem" app, against an iperf3 server running in the IP address of the GGSN outside the netns:
iperf3 -c 176.16.222.1 -u -V iperf3 -s -B 176.16.222.1
The iperf3 tries to fill in the MTU when sending packets, but there seems to be a problem when enqueueing them:
20230726174215423 DLLC ERROR llc.c:359 LLE(c34b1498/c914945e,SNDCP3){ASSIGNED_ADM} Cannot Tx 1480 bytes (N201-U=500)
20230726174215433 DTUN DEBUG app_modem.c:121 APN(internet): system wants to transmit IPv4 pkt to 176.16.222.1 (1476 bytes)
20230726174215433 DSNDCP INFO sndcp_prim.c:424 Rx from upper layers: SN-UNITDATA.request
20230726174215434 DSNDCP DEBUG sndcp.c:130 modem_sndcp_prim_down_cb(): Rx LL-UNITDATA.request TLLI=0xc914945e SAPI=SNDCP3 L3=[66 00 05 d5 45 00 05 c4 78 bc 40 00 40 11 a0 47 b0 10 de 02 b0 10 de 01 aa 53 14 51 05 b0 3b dd 00 00 2a ed 00 0a f5 b0 00 00 01 8c 21 52 df 52 61 ce 27 d9 5b ea e8 ec 6d fe 02 45 1b 9c cc dc ec 38 8f e5 29 e9 b0 a0 1c 01 2b 3b 39 e1 9c 51 2f c5 79 14 de c8 b6 13 23 c5 b1 ff 79 d0 5e 1b 04 b2 4e 3f 90 a3 3a 00 df 13 ab 43 8c b7 d3 a8 45 39 a2 70 06 76 c1 fe 19 95 76 3a 74 51 18 6c 5c 4d c1 a0 4b 80 51 3d 73 c6 95 14 e3 76 f9 af 1c f4 28 70 0d 4e 78 21 83 32 a8 12 82 a6 76 01 f3 75 36 77 08 8d 0f 16 c7 be 7a 1b 51 bf 64 9b 0f fc c3 86 bd 1f 0a b0 8c 6f f7 d2 01 da 5b 07 72 72 66 4e 80 55 a6 77 86 bb 76 5c 9c 48 85 a3 5f 97 70 ce b0 ff 79 f9 e0 10 92 f3 e0 bc a0 ee d2 08 90 55 04 6c 8a 28 31 fb 00 66 24 54 67 36 c9 1d 0c 71 ff 09 52 7a 1b 4d 77 02 87 47 89 9f 62 ae da 4c 14 88 8b f5 cc 28 0a df 59 89 e2 72 64 28 dc 0e b2 59 10 57 ae 60 70 9c 31 ee 5d 55 c1 66 82 70 aa 4c 3b aa 79 45 8f e1 06 3c 68 66 8f 0b 86 90 4e 73 fd a9 f3 2e 9b 4a 3f 58 69 82 b1 c1 c2 4e af 5a dc d0 5b 6b 22 17 4f 74 8b 17 6e 0d 23 13 23 c2 1b f3 b0 56 ec fa 3b 48 98 bd 9b 7e e4 c9 a5 37 3f ed 05 d2 0e 0f f4 21 af 9e d0 83 31 70 12 8b 14 96 46 bf b9 3a 64 0a 75 da 0f 8d 83 d9 8a 9b 26 0b 4c 65 1d 26 f1 9e 75 08 8a 48 03 64 c0 a1 de d6 59 ad 9f 6b f6 cf 4a 65 08 cf 18 68 54 16 8f af 61 8c 06 fb 6a 09 93 c9 4a fb 00 94 16 9c 2f f3 a6 5e 90 55 29 7e 3a b9 04 2d 69 06 f7 89 2e 53 52 67 c4 73 43 05 9a ce af f9 7d 77 26 c1 a5 aa c8 8e 0f 80 c4 00 be 71 3f 1a f8 38 f1 4c 06 59 07 ac 06 32 eb 5a d2 35 db 3d 11 0c fa af 04 8c 56 d0 a8 3a 2f 50 9f cb 0d 44 10 38 f9 ab 79 97 0a 11 8a 21 4a d1 0d 4b 8c ea f4 79 2b ac f0 48 52 67 b8 36 05 1f 2e bb e4 c5 d1 8c 35 d4 8e fb 8d 8d 8d 15 26 fe 37 fd bb 6b af 2a b4 11 97 24 b0 28 15 ce 95 97 d5 7f 62 8b 73 77 d7 7f a6 72 23 35 fb 60 65 de 84 54 b9 a0 30 21 3e 87 f2 a7 9c 82 0c 92 6a 28 e4 06 6e 84 e9 6a 1c 20 5c 30 dd 1b 80 71 88 9f 5b 3b 74 2d 18 ed 6e f7 8c 67 ba ed 05 06 13 76 58 c0 7b 1b 1d d9 23 14 30 ef 97 4c 1d 48 a2 8e 83 49 1b 6b 75 90 b6 a0 98 e9 7d b1 c7 fa 39 6e a5 18 9a 94 ab 6d 18 d2 1f 61 39 a1 2e ca 7f b9 23 73 7d 29 a1 6a bd f6 9b e2 d9 cf fa 0f ca 46 c3 be 4a cc 7d 19 9e 23 be 74 65 7c cc e8 d7 f7 6c 8a 64 7b 0b 14 d3 b5 3f 19 47 94 08 70 23 02 01 2f 4d 09 07 4d 1f a6 6f b0 3b b3 7d 14 75 74 e5 1b 93 0a 52 0e 2a 02 e2 60 a9 dd 52 42 c9 c7 ee ab fb 7f fb 81 09 07 7a e7 64 1d bf 56 ad 68 c6 bc 73 81 a9 5a 03 4d 3f 02 66 73 87 01 11 dc f2 ab f9 a6 77 f2 db f3 4b 1f 32 05 4f ea 96 bc 7b e3 a5 e0 b4 de 3b ed 34 1f 95 9e ed f9 aa a6 ef 56 ea 17 a4 1a ad ea 64 8c f3 4b 05 a1 cd 31 92 82 c4 fa 43 07 f2 01 a4 9c e4 ae 4c cd ad f0 34 ec cb 4b 4d 3a b3 c1 3f b5 1f 0c 6a 8b d1 fb 2f 4e d6 59 c1 a3 61 1c cf 01 26 32 5b 97 a9 9a 31 16 b3 11 10 e6 ec 0f 74 d4 9e eb 57 ae 95 30 bc 8b 2f 41 fc fc 73 46 f8 1b 06 c6 b6 9c e7 a9 c3 13 2c 9d 93 f8 cc 61 d5 ff 09 4e 67 dc 79 60 80 67 00 86 83 d5 45 ad 5c f0 21 2b 81 29 98 19 85 cc 70 2c 43 0f bb 13 4d 31 41 5c 49 af d1 3d 82 fc 72 74 6b 81 a9 d4 d8 4a 75 8e 2c 54 f8 b1 1c 21 5e d6 f5 f8 0d 51 13 bc 6b 09 e9 d6 a0 bf 62 f8 b0 a7 64 39 fb 71 a1 b3 53 b9 c2 4c 9d 93 3a 78 9f 73 12 5f 3a f3 c7 73 73 20 bc 82 59 79 f2 b5 b7 13 43 0e 73 f7 fd 4a df 51 9b 44 78 e7 7f 18 5a a0 fb 88 94 e6 3a 27 23 bf e7 10 bb 50 6e 4d 59 a9 9c 83 ca 67 d7 60 92 99 e5 5e a4 86 42 7e 7b 3a b7 4b c0 4f 85 71 52 0c 42 35 30 46 e8 62 85 96 42 d8 77 5c 9a f8 ab 74 52 a8 17 03 cf 16 34 18 fb e1 85 00 83 e8 b1 83 0e 4f 43 25 40 b5 29 2c e1 c1 8f 61 0d a2 63 2e 41 06 97 66 1a a6 38 db f4 bc 0d 70 c7 af 53 cd e6 be 00 bc 2b df 2a 15 98 dc 05 30 cd 25 bd 0f 59 74 ba cd ba 2d 67 c3 69 c4 72 00 40 76 7e 0f d9 95 bc 25 34 e6 30 89 f6 fa 6e d4 10 98 2d 32 b5 91 2e 4a e6 01 0f e2 34 d5 0f 91 b6 cb 49 e1 d2 86 6c 9b d4 06 16 59 93 86 68 d5 01 0b 47 ac 4b 92 fa a1 5d f4 46 a4 bc 89 3b 06 54 be e4 77 b6 0d 89 47 9d 70 9b 97 9e 0b 04 03 88 96 1b 63 31 81 3d 6d da 86 c8 a6 af 43 31 1f 99 7f da fa b9 44 a2 6c 31 ff 1d 3d 41 67 78 9f bb e3 2b 8b 7c dc 20230726174215434 DLLC INFO llc_prim.c:157 Rx from upper layers: LL-UNITDATA.request
20230726174215434 DLLC ERROR llc.c:359 LLE(c34b1498/c914945e,SNDCP3){ASSIGNED_ADM} Cannot Tx 1480 bytes (N201-U=500)
20230726174215441 DRLCMAC INFO rlcmac.c:789 TS=6 FN=93231 Rx Pkt DL Dummy Ctrl Block
20230726174215444 DTUN DEBUG app_modem.c:121 APN(internet): system wants to transmit IPv4 pkt to 176.16.222.1 (1476 bytes)
20230726174215445 DSNDCP INFO sndcp_prim.c:424 Rx from upper layers: SN-UNITDATA.request
20230726174215445 DSNDCP DEBUG sndcp.c:130 modem_sndcp_prim_down_cb(): Rx LL-UNITDATA.request TLLI=0xc914945e SAPI=SNDCP3 L3=[66 00 05 d6 45 00 05 c4 78 bd 40 00 40 11 a0 46 b0 10 de 02 b0 10 de 01 aa 53 14 51 05 b0 10 db 00 00 2a ed 00 0b 20 b1 00 00 01 8d 21 52 df 52 61 ce 27 d9 5b ea e8 ec 6d fe 02 45 1b 9c cc dc ec 38 8f e5 29 e9 b0 a0 1c 01 2b 3b 39 e1 9c 51 2f c5 79 14 de c8 b6 13 23 c5 b1 ff 79 d0 5e 1b 04 b2 4e 3f 90 a3 3a 00 df 13 ab 43 8c b7 d3 a8 45 39 a2 70 06 76 c1 fe 19 95 76 3a 74 51 18 6c 5c 4d c1 a0 4b 80 51 3d 73 c6 95 14 e3 76 f9 af 1c f4 28 70 0d 4e 78 21 83 32 a8 12 82 a6 76 01 f3 75 36 77 08 8d 0f 16 c7 be 7a 1b 51 bf 64 9b 0f fc c3 86 bd 1f 0a b0 8c 6f f7 d2 01 da 5b 07 72 72 66 4e 80 55 a6 77 86 bb 76 5c 9c 48 85 a3 5f 97 70 ce b0 ff 79 f9 e0 10 92 f3 e0 bc a0 ee d2 08 90 55 04 6c 8a 28 31 fb 00 66 24 54 67 36 c9 1d 0c 71 ff 09 52 7a 1b 4d 77 02 87 47 89 9f 62 ae da 4c 14 88 8b f5 cc 28 0a df 59 89 e2 72 64 28 dc 0e b2 59 10 57 ae 60 70 9c 31 ee 5d 55 c1 66 82 70 aa 4c 3b aa 79 45 8f e1 06 3c 68 66 8f 0b 86 90 4e 73 fd a9 f3 2e 9b 4a 3f 58 69 82 b1 c1 c2 4e af 5a dc d0 5b 6b 22 17 4f 74 8b 17 6e 0d 23 13 23 c2 1b f3 b0 56 ec fa 3b 48 98 bd 9b 7e e4 c9 a5 37 3f ed 05 d2 0e 0f f4 21 af 9e d0 83 31 70 12 8b 14 96 46 bf b9 3a 64 0a 75 da 0f 8d 83 d9 8a 9b 26 0b 4c 65 1d 26 f1 9e 75 08 8a 48 03 64 c0 a1 de d6 59 ad 9f 6b f6 cf 4a 65 08 cf 18 68 54 16 8f af 61 8c 06 fb 6a 09 93 c9 4a fb 00 94 16 9c 2f f3 a6 5e 90 55 29 7e 3a b9 04 2d 69 06 f7 89 2e 53 52 67 c4 73 43 05 9a ce af f9 7d 77 26 c1 a5 aa c8 8e 0f 80 c4 00 be 71 3f 1a f8 38 f1 4c 06 59 07 ac 06 32 eb 5a d2 35 db 3d 11 0c fa af 04 8c 56 d0 a8 3a 2f 50 9f cb 0d 44 10 38 f9 ab 79 97 0a 11 8a 21 4a d1 0d 4b 8c ea f4 79 2b ac f0 48 52 67 b8 36 05 1f 2e bb e4 c5 d1 8c 35 d4 8e fb 8d 8d 8d 15 26 fe 37 fd bb 6b af 2a b4 11 97 24 b0 28 15 ce 95 97 d5 7f 62 8b 73 77 d7 7f a6 72 23 35 fb 60 65 de 84 54 b9 a0 30 21 3e 87 f2 a7 9c 82 0c 92 6a 28 e4 06 6e 84 e9 6a 1c 20 5c 30 dd 1b 80 71 88 9f 5b 3b 74 2d 18 ed 6e f7 8c 67 ba ed 05 06 13 76 58 c0 7b 1b 1d d9 23 14 30 ef 97 4c 1d 48 a2 8e 83 49 1b 6b 75 90 b6 a0 98 e9 7d b1 c7 fa 39 6e a5 18 9a 94 ab 6d 18 d2 1f 61 39 a1 2e ca 7f b9 23 73 7d 29 a1 6a bd f6 9b e2 d9 cf fa 0f ca 46 c3 be 4a cc 7d 19 9e 23 be 74 65 7c cc e8 d7 f7 6c 8a 64 7b 0b 14 d3 b5 3f 19 47 94 08 70 23 02 01 2f 4d 09 07 4d 1f a6 6f b0 3b b3 7d 14 75 74 e5 1b 93 0a 52 0e 2a 02 e2 60 a9 dd 52 42 c9 c7 ee ab fb 7f fb 81 09 07 7a e7 64 1d bf 56 ad 68 c6 bc 73 81 a9 5a 03 4d 3f 02 66 73 87 01 11 dc f2 ab f9 a6 77 f2 db f3 4b 1f 32 05 4f ea 96 bc 7b e3 a5 e0 b4 de 3b ed 34 1f 95 9e ed f9 aa a6 ef 56 ea 17 a4 1a ad ea 64 8c f3 4b 05 a1 cd 31 92 82 c4 fa 43 07 f2 01 a4 9c e4 ae 4c cd ad f0 34 ec cb 4b 4d 3a b3 c1 3f b5 1f 0c 6a 8b d1 fb 2f 4e d6 59 c1 a3 61 1c cf 01 26 32 5b 97 a9 9a 31 16 b3 11 10 e6 ec 0f 74 d4 9e eb 57 ae 95 30 bc 8b 2f 41 fc fc 73 46 f8 1b 06 c6 b6 9c e7 a9 c3 13 2c 9d 93 f8 cc 61 d5 ff 09 4e 67 dc 79 60 80 67 00 86 83 d5 45 ad 5c f0 21 2b 81 29 98 19 85 cc 70 2c 43 0f bb 13 4d 31 41 5c 49 af d1 3d 82 fc 72 74 6b 81 a9 d4 d8 4a 75 8e 2c 54 f8 b1 1c 21 5e d6 f5 f8 0d 51 13 bc 6b 09 e9 d6 a0 bf 62 f8 b0 a7 64 39 fb 71 a1 b3 53 b9 c2 4c 9d 93 3a 78 9f 73 12 5f 3a f3 c7 73 73 20 bc 82 59 79 f2 b5 b7 13 43 0e 73 f7 fd 4a df 51 9b 44 78 e7 7f 18 5a a0 fb 88 94 e6 3a 27 23 bf e7 10 bb 50 6e 4d 59 a9 9c 83 ca 67 d7 60 92 99 e5 5e a4 86 42 7e 7b 3a b7 4b c0 4f 85 71 52 0c 42 35 30 46 e8 62 85 96 42 d8 77 5c 9a f8 ab 74 52 a8 17 03 cf 16 34 18 fb e1 85 00 83 e8 b1 83 0e 4f 43 25 40 b5 29 2c e1 c1 8f 61 0d a2 63 2e 41 06 97 66 1a a6 38 db f4 bc 0d 70 c7 af 53 cd e6 be 00 bc 2b df 2a 15 98 dc 05 30 cd 25 bd 0f 59 74 ba cd ba 2d 67 c3 69 c4 72 00 40 76 7e 0f d9 95 bc 25 34 e6 30 89 f6 fa 6e d4 10 98 2d 32 b5 91 2e 4a e6 01 0f e2 34 d5 0f 91 b6 cb 49 e1 d2 86 6c 9b d4 06 16 59 93 86 68 d5 01 0b 47 ac 4b 92 fa a1 5d f4 46 a4 bc 89 3b 06 54 be e4 77 b6 0d 89 47 9d 70 9b 97 9e 0b 04 03 88 96 1b 63 31 81 3d 6d da 86 c8 a6 af 43 31 1f 99 7f da fa b9 44 a2 6c 31 ff 1d 3d 41 67 78 9f bb e3 2b 8b 7c dc 20230726174215445 DLLC INFO llc_prim.c:157 Rx from upper layers: LL-UNITDATA.request
20230726174215445 DLLC ERROR llc.c:359 LLE(c34b1498/c914945e,SNDCP3){ASSIGNED_ADM} Cannot Tx 1480 bytes (N201-U=500)
20230726174215453 DTUN DEBUG app_modem.c:121 APN(internet): system wants to transmit IPv4 pkt to 176.16.222.1 (53 bytes)
These are all inside the netns used by "modem":
# ip addr
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
3: modem4: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 500
link/none
inet 176.16.222.3/30 scope global modem4
valid_lft forever preferred_lft forever
inet6 fe80::75d:7419:9433:6fee/64 scope link stable-privacy proto kernel_ll
valid_lft forever preferred_lft forever
# ip l
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
3: modem4: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN mode DEFAULT group default qlen 500
link/none
"Activate PDP Context Accept" sent to the MS contains:
Maximum SDU size: 1520 octets (153)
Related issues
Updated by pespin 5 months ago
LLC XID transmitted SGSN -> MS contains:
MS-SGSN LLC (Mobile Station - Serving GPRS Support Node Logical Link Control) SAPI: User data 3
Address field SAPI: LL3
0... .... = Protocol Discriminator_bit: OK
.1.. .... = Command/Response bit: DownLink/UpLink = Command/Response
.... 0011 = SAPI: User data 3 (3)
Unnumbered frame: XID
111. .... = U format: 0x7
...1 .... = P/F bit: True
.... 1011 = Command/Response: XID (0xb)
FCS: 0x4e7c8c (correct)
Information Field: Length = 8
XID Parameter Type: Version (LLC version number) - Value: 0
0... .... = XL Bit: 0x0
.000 00.. = Type: 0
.... ..01 = Length: 1
0000 0000 = Parameter Byte: 0x00
XID Parameter Type: N201-U (max info field length for U and UI frames) - Value: 500
0... .... = XL Bit: 0x0
.001 01.. = Type: 5
.... ..10 = Length: 2
0000 0001 = Parameter Byte: 0x01
1111 0100 = Parameter Byte: 0xf4
XID Parameter Type: N201-I (max info field length for I frames) - Value: 1503
0... .... = XL Bit: 0x0
.001 10.. = Type: 6
.... ..10 = Length: 2
0000 0101 = Parameter Byte: 0x05
1101 1111 = Parameter Byte: 0xdf
Updated by pespin 5 months ago
As a reference, configuring ipoerf3 to use TCP and forcing a lower MSS (less than N201-U) seems to be working more or less fine:
# iperf3 -c 176.16.222.1 --set-mss 300 Connecting to host 176.16.222.1, port 5201 [ 5] local 176.16.222.2 port 55386 connected to 176.16.222.1 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 34.6 KBytes 283 Kbits/sec 0 3.38 KBytes [ 5] 1.00-2.00 sec 0.00 Bytes 0.00 bits/sec 0 4.50 KBytes [ 5] 2.00-3.00 sec 0.00 Bytes 0.00 bits/sec 0 5.62 KBytes [ 5] 3.00-4.00 sec 0.00 Bytes 0.00 bits/sec 0 6.75 KBytes [ 5] 4.00-5.00 sec 0.00 Bytes 0.00 bits/sec 0 6.75 KBytes [ 5] 5.00-6.00 sec 0.00 Bytes 0.00 bits/sec 0 6.75 KBytes [ 5] 6.00-7.00 sec 0.00 Bytes 0.00 bits/sec 0 7.59 KBytes [ 5] 7.00-8.00 sec 0.00 Bytes 0.00 bits/sec 0 7.88 KBytes [ 5] 8.00-9.00 sec 0.00 Bytes 0.00 bits/sec 0 8.44 KBytes [ 5] 9.00-10.00 sec 0.00 Bytes 0.00 bits/sec 0 9.00 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 34.6 KBytes 28.3 Kbits/sec 0 sender [ 5] 0.00-17.72 sec 19.1 KBytes 8.84 Kbits/sec receiver
Updated by pespin 5 months ago
- Status changed from New to Feedback
The N201 values actually have nothing to do with MTU, but with LLC segments, where max segment size can be smaller than MTU.
N201 forwarding LLC -> SNDCP code was missing, I submitted it to libosmo-gprs-rlcmac around these patches:
remote: https://gerrit.osmocom.org/c/libosmo-gprs/+/33947 llc: Introduce function to log XID fields and use upon Rx/Tx
remote: https://gerrit.osmocom.org/c/libosmo-gprs/+/33948 llc: Apply N201-I & N201-U requested by the network
remote: https://gerrit.osmocom.org/c/libosmo-gprs/+/33949 llc: Submit LL-XID-IND to L3 if N201-U or N201-I changes
remote: https://gerrit.osmocom.org/c/libosmo-gprs/+/33950 sndcp: Update n201_u & n201_i indicatd by LLC layer
remote: https://gerrit.osmocom.org/c/libosmo-gprs/+/33952 sndcp: Initialize N201-U & N201-I to default settings
After those are used, iperf3 is capable to transmit bigger IP packets. I had to cap the amount of data set though (150K), otherwise it clogs the socket and it's too much data to be sent over the GPRS link using only 1 TS:
# iperf3 -c 176.16.222.1 -u -V -n 150K
iperf 3.14
Linux pespin-thinkpad 6.4.4-arch1-1 #1 SMP PREEMPT_DYNAMIC Wed, 19 Jul 2023 19:19:38 +0000 x86_64
Control connection MSS 1448
Setting UDP block size to 1448
Time: Wed, 26 Jul 2023 19:08:12 GMT
Connecting to host 176.16.222.1, port 5201
Cookie: wmx7r6lztnj2vjb2kih6darkprex4m5cy7ws
Target Bitrate: 1048576
[ 5] local 176.16.222.2 port 50442 connected to 176.16.222.1 port 5201
Starting Test: protocol: UDP, 1 streams, 1448 byte blocks, omitting 0 seconds, 153600 bytes to send, tos 0
[ ID] Interval Transfer Bitrate Total Datagrams
[ 5] 0.00-1.00 sec 129 KBytes 1.05 Mbits/sec 91
[ 5] 1.00-1.17 sec 22.6 KBytes 1.08 Mbits/sec 16
- - - - - - - - - - - - - - - - - - - - - - - - -
Test Complete. Summary Results:
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-1.17 sec 151 KBytes 1.06 Mbits/sec 0.000 ms 0/107 (0%) sender
[ 5] 0.00-90.68 sec 151 KBytes 13.7 Kbits/sec 830.780 ms 0/107 (0%) receiver
CPU Utilization: local/sender 5.2% (2.4%u/2.8%s), remote/receiver 0.0% (0.0%u/0.0%s)
iperf Done.
Updated by fixeria 2 months ago
- Related to Feature #5503: expose GPRS user plane via tun device added
Updated by pespin 1 day ago
MTU is provided by PCO in IPv4 and through SLAAC in IPv6 (see https://github.com/open5gs/open5gs/issues/2754 for more info).
I think osmo-ggsn is not yet providing it to the MS, hence why one may not see it while looking at pcaps.
Updated by pespin 1 day ago
- Related to Feature #6298: osmo-ggsn not providing MTU of the GTP tunnel to the MS added
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