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tcp port 0 floodding

byju70
Level 1
Level 1

I found a peculiar problem in router. My log shows lots of incomming traffic from WAN(internet) to my router with TCP port 0. This is freezing my WAN link and giving DOS to my serial interface. How do we resolve the DOS attack of serial interface.

Thankx

1 Accepted Solution

Accepted Solutions

milan.kulik
Level 10
Level 10

Hi.

Regarding http://www.iana.org/assignments/port-numbers TCP port 0 is reserved.

So I think you can configure an incoming ACL on your WAN interface denying any TCP traffic with destination TCP port 0.

You should also ask your ISP to configure an outgoing ACL on his side of the line.

Regards,

Milan

View solution in original post

1 Reply 1

milan.kulik
Level 10
Level 10

Hi.

Regarding http://www.iana.org/assignments/port-numbers TCP port 0 is reserved.

So I think you can configure an incoming ACL on your WAN interface denying any TCP traffic with destination TCP port 0.

You should also ask your ISP to configure an outgoing ACL on his side of the line.

Regards,

Milan

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