[Snort-users] Interesting traffic...

Ashley Thomas athomas at ...3539...
Tue Feb 26 19:20:02 EST 2002


> OTOH, the TTL:63 implies one-hop from the sender - so that implies a LAN
> host...

only routers while forwarding reduces the TTL,right ?
so TTL 63 means that it passed one router. So it cant be on the same
subnet !!

correct me if i am wrong !




On Wed, 27 Feb 2002, Jason Haar wrote:

> On Tue, Feb 26, 2002 at 04:11:35PM -0600, Mark Mason wrote:
>
> > [**] [1:528:2] BAD TRAFFIC loopback traffic [**]
> > [Classification: Potentially Bad Traffic] [Priority: 2]
> > 02/26-11:25:30.667238 127.0.0.1:15158 -> xxx.xxx.xxx.xxx:6473
> > TCP TTL:63 TOS:0x0 ID:9155 IpLen:28 DgmLen:68 DF
> > IP Options (2) => LSRR NOP
> > ******S* Seq: 0x1BE3F7DA  Ack: 0x0  Win: 0xFFFF  TcpLen: 40
> > TCP Options (6) => MSS: 16344 NOP WS: 1 NOP NOP TS: 281854 0
>
> Well, if this isn't local - I'd say it's time to reconfigure your perimeter
> router. Remember: INGRESS/EGRESS FILTERS!!! :-)
>
> OTOH, the TTL:63 implies one-hop from the sender - so that implies a LAN
> host...
>
> Compaq Insight Manager has a lovely bug where laptops it's installed on
> broadcast their services from 127.0.0.1 to 127.0.0.1 (yeah, tell me how they
> did that!) - but not on those port numbers...
>
> --
> Cheers
>
> Jason Haar
>
> Information Security Manager
> Trimble Navigation Ltd.
> Phone: +64 3 9635 377 Fax: +64 3 9635 417
>
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