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ip tcp adjust-mms on cat6500 not supported ?

gorkristcco
Level 1
Level 1

I have problem with packetsize on network using GRE/IPsec. This usualy goes away with ip tcp adjust-mms command on tunnel interface.

It looks like cat6500 does not support this command on tunnel interface to resolve problem with packetsize.

Is there any other substitute ?

Any version av IOS for 6500 which supports this command ?

ip mtu does not help with this problem

3 Replies 3

Prashanth Krishnappa
Cisco Employee
Cisco Employee

What kind of Supervisor do you have. It is supported in global config mode in Sup720

C6509E-A#sh mod 5

Mod Ports Card Type Model Serial No.

--- ----- -------------------------------------- ------------------ -----------

5 2 Supervisor Engine 720 (Active) WS-SUP720-BASE SADxxxxxxxx

Mod MAC addresses Hw Fw Sw Status

--- ---------------------------------- ------ ------------ ------------ -------

5 0011.92e6.ea50 to 0011.92e6.ea53 3.1 7.7(1) 12.2(17d)SXB Ok

Mod Sub-Module Model Serial Hw Status

--- --------------------------- ------------------ ------------ ------- -------

5 Policy Feature Card 3 WS-F6K-PFC3A SADxxxxxxxx 2.3 Ok

5 MSFC3 Daughterboard WS-SUP720 SADxxxxxxxx 2.2 Ok

Mod Online Diag Status

--- -------------------

5 Pass

C6509E-A#conf t

Enter configuration commands, one per line. End with CNTL/Z.

C6509E-A(config)#ip tcp mss ?

<0-10000> MSS

Thank you for response.

It's sup2:

Mod Ports Card Type Model Serial No.

--- ----- -------------------------------------- ------------------ -----------

1 2 Catalyst 6000 supervisor 2 (Active) WS-X6K-SUP2-2GE SAL0824A3T2

2 2 IPSec VPN Accelerator WS-SVC-IPSEC-1 SAD081209E1

3 16 SFM-capable 16 port 1000mb GBIC WS-X6516A-GBIC SAL081230A2

I do have option for that command. Does it affect all traffic on the switch/router ?

Main goal is to force end stations running xp and win2003 to change theres mss and mtu.

Will this command make it possible ?

Edit :

Here is all modules:

Mod Ports Card Type Model Serial No.

--- ----- -------------------------------------- ------------------ -----------

1 2 Catalyst 6000 supervisor 2 (Active) WS-X6K-SUP2-2GE SAL0824A3T2

2 2 IPSec VPN Accelerator WS-SVC-IPSEC-1 SAD081209E1

3 16 SFM-capable 16 port 1000mb GBIC WS-X6516A-GBIC SAL081230A2

Mod MAC addresses Hw Fw Sw Status

--- ---------------------------------- ------ ------------ ------------ -------

1 0009.1247.86b8 to 0009.1247.86b9 5.0 7.1(1) 12.2(17d)SXB Ok

2 000f.348d.e2ac to 000f.348d.e2af 1.2 7.2(1) 8.3(0.110)TE Ok

3 000f.34cb.7960 to 000f.34cb.796f 4.0 7.2(1) 8.3(0.110)TE Ok

Mod Sub-Module Model Serial Hw Status

--- --------------------------- ------------------ ------------ ------- -------

1 Policy Feature Card 2 WS-F6K-PFC2 SAL082297P3 3.4 Ok

1 Cat6k MSFC 2 daughterboard WS-F6K-MSFC2 SAL0824A7DA 2.6 Ok

Mod Online Diag Status

--- -------------------

1 Pass

2 Pass

3 Pass

It runs IOS 12.2(17d)SXB1 with configured ACL, OSPF, GRE and IPsec.

I don't get it.

Cisco doc says that ip tcp mss command affects only TCP sessions generated from and terminated by router.

Will this help with all sessions passing through router as well ?