Full Disclosure mailing list archives
Re: Odd packet?
From: Steffen Schumacher <ssch () wheel dk>
Date: Tue, 25 May 2004 22:35:25 +0200
On 25.05.2004 21:55:19 +0000, Maarten wrote:
On Tuesday 25 May 2004 15:57, Gregh wrote:Getting quite a few 127.0.0.1 on differing ports lately and I know it isn't originating FROM this machine. Haven't sniffed any packets but they come up in logs.Not saying what you see must be wrong but, if your routing / packetfilter / kernelsettings were properly configured you would not ever get these packets as they would be dropped before they would reach your machine. If not your ISP, then you (indeed everyone) should always drop packets coming from interfaces they _cannot_ originate from. Antispoofing, that's called. Especially 127.x.x.x is not routed by any ISP which is worth their name.
Logs may still detect packets constructed with a 127/8 address. However, as you said, no ISP, which has to follow rules and regulations in the western world allows spoofing of or even routing of the 127/8 net. So Maarten, if you want to write again, please have packetdumps proving you case. /Steffen
Maybe review your setting of /proc/sys/net/ipv4/conf/eth0/rp_filter ?Anyone know of anything that spoofs as coming from 127.0.0.1 but comes from outside and what it may relate to? Only been the last week and nothing changed here. Thanks for any help.Notwithstanding what I said above, spoofing 127.0.0.1 would not really serve a purpose for an attacker. A full TCP handshake would never occur, and a DoS is likewise impossible (or at least real unlikely). But who knows... Any packet dumps available ? Maarten -- Yes of course I'm sure it's the red cable. I guarante[^%!/+)F#0c|'NO CARRIER _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
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Current thread:
- Odd packet? Gregh (May 25)
- Re: Odd packet? Ron DuFresne (May 25)
- Re: Odd packet? Maarten (May 25)
- Re: Odd packet? Steffen Schumacher (May 25)
- Re: Odd packet? Maarten (May 25)
- Re: Odd packet? Valdis . Kletnieks (May 26)
- Re: Odd packet? Steffen Schumacher (May 26)
- Re: Odd packet? Jeff Kell (May 26)
- Re: Odd packet? Valdis . Kletnieks (May 26)
- Re: Odd packet? Steffen Schumacher (May 26)
- RE: Odd packet? Aditya, ALD [Aditya Lalit Deshmukh] (May 26)
- Re: Odd packet? Steffen Schumacher (May 27)
- Re: Odd packet? Steffen Schumacher (May 25)
- Re: Odd packet? Valentino Squilloni - Ouz (May 26)
- Re: Odd packet? Steffen Schumacher (May 26)