Forum Discussion

Altostratus

Jan 06, 2017

Solved

How could I exclude Vulnerability scanners from Session Tracking?

I have enabled session tracking on an application and it has quickly blocked my vulnerability scanner. Of course this is "scan interference" and makes the results invalid. The options on the IP Ad...

application delivery

LTM

sync group

uknoodler_23999
Jan 10, 2017
Is it bad form to answer my own question?

Anyhow, using logging I discovered that the violation name wasn't matching correctly. Here is a rule that I've now deployed and tested.

when ASM_REQUEST_DONE { if {([ASM::violation names] contains "SESSION_AWARENESS" && [ASM::violation count] < 2 && [IP::addr [IP::client_addr] equals n.n.n.n/m])} { ASM::unblock } }

JRahm

Admin

Jun 06, 2011

To clarify, changing the mtu on the LTM vlan interface worked, but you want the full 1480 instead of 1432? If so, open a support case, if not, please re-state the question.

Aswin_mk
MVP
Aug 28, 2024
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As per my exp, It is by design the VLAN name cannot rename once it is created, all other parameters and options of the VLAN can be changed. The name is used as a fixed reference point for the VLAN allowing it to be referenced, thus changing the name would lose the reference to this specific VLAN. Only option to modify vlan name in config file & reload it. Or as you mentioned, we have to delete and config again .
- Amr_Ali
  MVP
  Aug 28, 2024
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  how i can make this from config file , just i need the steps
- Amr_Ali
  MVP
  Aug 28, 2024
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  and if change the name in config file , is that applicable in rseries
Aswin_mk
MVP
Aug 29, 2024
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i am not tried or done that in device.
The recommended way is to delete the VLAN and re-create it again.
But You could go into the configuration files and change the name and reload the configuration from the files. But then you need to edit the name on all places where it is used. You can try if needed. but always best and better way is deleting the VLAN and re-create it again.

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MTU Discovery for IP version 6 with the BIG-IP LTM","id":"message:127799","entityType":"FORUM_TOPIC","eventPath":"category:Forums/community:zihoc95639board:TechnicalForum/message:127799","revisionNum":1,"repliesCount":1,"author":{"__ref":"User:user:329138"},"depth":0,"hasGivenKudo":false,"board":{"__ref":"Forum:board:TechnicalForum"},"conversation":{"__ref":"Conversation:conversation:127799"},"readOnly":false,"editFrozen":false,"showMoveIndicator":false,"moderationData":{"__ref":"ModerationData:moderation_data:127799"},"body@stripHtml({\"truncateLength\":200})":"We run a virtual machine F5 BIG-IP LTM VE with an IPv6 Gateway module. We do not have a native IPv6 connectivity yet. So we have an 6in4 tunnel (MTU =1480) setup on a Cisco Router. \n More abou...","body@stringLength":"7519","rawBody":"We run a virtual machine F5 BIG-IP LTM VE with an IPv6 Gateway module. We do not have a native IPv6 connectivity yet. So we have an 6in4 tunnel (MTU =1480) setup on a Cisco Router.

More about the product :

License Type Evaluation Licensed Date May 25, 2011 License Expiration Date Aug 24, 2011 Active Modules

• BIG-IP VE Trial

o ADD IPV6 GATEWAY

o ADD RATE SHAPING

o ADD RAMCACHE

o 50 MBPS COMPRESSION

o SSL 500 TPS Per Core

We are facing an issue with packets larger than 1432 bytes are send to the LTM from the Internet. When icmpv6 echo are send the icmp reply from LTM doesn’t come back.

fronsac:~$ ping6 ipv6.sigma.fr -s 1432

PING ipv6.sigma.fr(2001:470:caa8:1082::149) 1432 data bytes

1440 bytes from 2001:470:caa8:1082::149: icmp_seq=1 ttl=44 time=28.5 ms

1440 bytes from 2001:470:caa8:1082::149: icmp_seq=2 ttl=44 time=28.9 ms

--- ipv6.sigma.fr ping statistics ---

2 packets transmitted, 2 received, 0% packet loss, time 1004ms

rtt min/avg/max/mdev = 28.551/28.749/28.948/0.261 ms

fronsac:~$ ping6 ipv6.sigma.fr -s 1433

PING ipv6.sigma.fr(2001:470:caa8:1082::149) 1433 data bytes

--- ipv6.sigma.fr ping statistics ---

4 packets transmitted, 0 received, 100% packet loss, time 3013ms

I tried also with the self adress :

lboue@fronsac:~$ ping6 -s 1500 2001:470:CAA8:1565::10 -s 1432

PING 2001:470:CAA8:1565::10(2001:470:caa8:1565::10) 1432 data bytes

1440 bytes from 2001:470:caa8:1565::10: icmp_seq=1 ttl=44 time=28.4 ms

--- 2001:470:CAA8:1565::10 ping statistics ---

1 packets transmitted, 1 received, 0% packet loss, time 0ms

rtt min/avg/max/mdev = 28.426/28.426/28.426/0.000 ms

lboue@fronsac:~$ ping6 -s 1500 2001:470:CAA8:1565::10 -s 1433

PING 2001:470:CAA8:1565::10(2001:470:caa8:1565::10) 1433 data bytes

If I ping an linux host in the same subnet it works :

lboue@fronsac:~$ ping6 -s 1500 2001:470:CAA8:1565::11 -s 1433

PING 2001:470:CAA8:1565::11(2001:470:caa8:1565::11) 1433 data bytes

From 2001:470:0:7b::2 icmp_seq=1 Packet too big: mtu=1480

1441 bytes from 2001:470:caa8:1565::11: icmp_seq=3 ttl=54 time=28.8 ms

1441 bytes from 2001:470:caa8:1565::11: icmp_seq=4 ttl=54 time=28.9 ms

1441 bytes from 2001:470:caa8:1565::11: icmp_seq=5 ttl=54 time=29.3 ms

When I set manually the MTU to 1480 from the web interface, it works :

fronsac:~$ ping6 ipv6.sigma.fr -s 1433

PING ipv6.sigma.fr(2001:470:caa8:1082::149) 1433 data bytes

From gige-gbge0.tserv10.par1.ipv6.he.net icmp_seq=1 Packet too big: mtu=1480

1441 bytes from 2001:470:caa8:1082::149: icmp_seq=2 ttl=44 time=29.7 ms

1441 bytes from 2001:470:caa8:1082::149: icmp_seq=3 ttl=44 time=29.7 ms

1441 bytes from 2001:470:caa8:1082::149: icmp_seq=4 ttl=44 time=28.9 ms

1441 bytes from 2001:470:caa8:1082::149: icmp_seq=5 ttl=44 time=29.9 ms

After that, from the console :

[root@GSF5LTMV6:Active] config ifconfig EXTERNAL

EXTERNAL Link\nencap:Ethernet HWaddr 00:0C:29:20:71:98

inet6 addr:\nfe80::20c:29ff:fe20:7198/64 Scope:Link

inet6 addr:\n2001:470:caa8:1565::10/64 Scope:Global

UP BROADCAST\nRUNNING MULTICAST MTU:1480 Metric:1

To inderstand what is going on:

[root@GSF5LTMV6:Active] config tcpdump -ni EXTERNAL ip6

tcpdump: verbose output suppressed, use -v or -vv for full\nprotocol decode

listening on EXTERNAL, link-type EN10MB (Ethernet), capture\nsize 108 bytes

11:16:34.983903 IP6 2001:660:7301:4994::22 >\n2001:470:caa8:1082::149: frag (0|1432) ICMP6, echo request, seq 9, length 1432

11:16:34.983917 IP6 2001:660:7301:4994::22 >\n2001:470:caa8:1082::149: frag (1432|56)

11:16:34.983947 IP6 2001:470:caa8:1082::149 >\n2001:660:7301:4994::22: frag (0|1448) ICMP6, echo reply, seq 9, length 1448

11:16:34.983953 IP6 2001:470:caa8:1082::149 >\n2001:660:7301:4994::22: frag (1448|40)

11:16:34.987075 IP6 2001:470:caa8:80::1 >\n2001:470:caa8:1082::149: ICMP6, packet too big, mtu 1480, length 1240

11:16:36.488155 IP6 2001:660:7301:4994::22 >\n2001:470:caa8:1082::149: frag (0|1432) ICMP6, echo request, seq 10, length 1432

11:16:36.488173 IP6 2001:660:7301:4994::22 >\n2001:470:caa8:1082::149: frag (1432|56)

11:16:36.488205 IP6 2001:470:caa8:1082::149 >\n2001:660:7301:4994::22: frag (0|1448) ICMP6, echo reply, seq 10, length 1448

11:16:36.488212 IP6 2001:470:caa8:1082::149 >\n2001:660:7301:4994::22: frag (1448|40)

11:16:36.491372 IP6 2001:470:caa8:80::1 >\n2001:470:caa8:1082::149: ICMP6, packet too big, mtu 1480, length 1240

The router where the 6in4 tunnel is setup (2001:470:caa8:80::1)\nreply « packet too big » message but the LTE VE doesn’t change is\nMTU.

interface Tunnel0

description HE IPv6 Tunnel Broker

no ip address

ipv6 address 2001:470:1F12:50F::2/64

ipv6 enable

tunnel source 194.XX.XX.X

tunnel destination 216.66.84.42

tunnel mode ipv6ip

end

GSRTIP6sh run int fa0/0

Building configuration...

Current configuration : 329 bytes

interface FastEthernet0/0

description DMZ Interco

no ip address

duplex auto

speed auto

ipv6 address FE80::F1 link-local

ipv6 address 2001:470:CAA8:80::1/64

ipv6 mtu 1480

ipv6 nd prefix default no-advertise

ipv6 nd advertisement-interval

ipv6 nd ra suppress

ipv6 nd ra interval msec 3000

ipv6 nd ra lifetime 10

end

Do I have another option to fix this issue ?

Regards,

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