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тАО02-18-2008 08:33 AM
тАО02-18-2008 08:33 AM
Procurve Security
Hi,
IтАЩm thinking of implementing VLANтАЩs across all our switches to carry internet traffic to all servers / firewalls that require internet traffic, thus reduce the cable run between racks. However I have concerns about the security aspects, esp VLAN Hopping. IтАЩve done some reading but cannot find anything related to HP, only Cisco. IтАЩve had opinion on it as a weak solution. The internet VLANтАЩs will all connect to either Cisco ASAтАЩs or ISA Servers. I was also thinking of not allocating an IP to any of the VLANтАЩs that carry internet traffic. Also what about other security risks, such as ARP poisoning etc?
Many thanks
IтАЩm thinking of implementing VLANтАЩs across all our switches to carry internet traffic to all servers / firewalls that require internet traffic, thus reduce the cable run between racks. However I have concerns about the security aspects, esp VLAN Hopping. IтАЩve done some reading but cannot find anything related to HP, only Cisco. IтАЩve had opinion on it as a weak solution. The internet VLANтАЩs will all connect to either Cisco ASAтАЩs or ISA Servers. I was also thinking of not allocating an IP to any of the VLANтАЩs that carry internet traffic. Also what about other security risks, such as ARP poisoning etc?
Many thanks
3 REPLIES 3
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тАО02-20-2008 12:55 AM
тАО02-20-2008 12:55 AM
Re: Procurve Security
In mine personal view i would not add in any switch/router an ip address in that vlan. No ip adress means no option to get in contact with l3/management part of the switch/router. And allways make sure you boost up the security on those switches like only ssh and management ip adresses.
But for the rest i do not know any security risks when using the switches just for l2.
There can allways be security risks in the firmware so allways keep an eye on the firmware levels.
Good Luck
But for the rest i do not know any security risks when using the switches just for l2.
There can allways be security risks in the firmware so allways keep an eye on the firmware levels.
Good Luck
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тАО02-20-2008 03:46 AM
тАО02-20-2008 03:46 AM
Re: Procurve Security
Thank you for the reply. What I've done for now is to create 4 VLAN's on the required switches, with no IP address in the VLAN that carries internet traffic, the VLAN's that carry traffic for internal processing have IP's. I've also enabled SSH. Is that woud you recommend.
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тАО02-20-2008 05:59 AM
тАО02-20-2008 05:59 AM
Re: Procurve Security
Here are some other suggestions. They may or may not apply to your environment.
1) Disable spanning tree (bpdu-filter or bpdu-guard) on all interfaces going to servers.
2) Disable CDP or LLDP.
3) If the switches support it, statically assign MAC addresses to ports and disable mac address learning.
4) If used by the switches, disable any "stacking" protocol that automatically allows multiple switches be managed as one.
The motivation for 1, 2, and 4 is to eliminate as many methods as possible for an attacker to send packets that need to be processed by the switch.
casevh
1) Disable spanning tree (bpdu-filter or bpdu-guard) on all interfaces going to servers.
2) Disable CDP or LLDP.
3) If the switches support it, statically assign MAC addresses to ports and disable mac address learning.
4) If used by the switches, disable any "stacking" protocol that automatically allows multiple switches be managed as one.
The motivation for 1, 2, and 4 is to eliminate as many methods as possible for an attacker to send packets that need to be processed by the switch.
casevh
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