Re: ip address on dhcp client
On Mon, 14 Jul 2014 22:33:11 +0530
rajiv chavan <rc214105@gmail.com> wrote:
> On Mon, 14 Jul 2014 07:53:06 +0530
> - Hide quoted text -
> rajiv chavan <rc214105@gmail.com> wrote:
>
> > Mon, 14 Jul 2014 07:26:20 +0530
> >
> > Thank you Mett.
> > Traceroute packets from another host dropped by ISP netwoek at
> > 218.248.0.0
> >
> > >netstat -rn
> >
> > Destination Gateway Genmask Flags MSS Window
> > irtt Iface 0.0.0.0 0.0.0.0 0.0.0.0 U
> > 0 0 0 ppp0 117.0.0.0 0.0.0.0 255.0.0.0
> > U 0 0 0 eth0 117.222.8.1 0.0.0.0
> > 255.255.255.255 UH 0 0 0 ppp0 127.0.0.0
> > 0.0.0.0 255.0.0.0 U 0 0 0 lo
> > 192.168.1.0 0.0.0.0 255.255.255.0 U 0
> > 0 0 eth0 224.0.0.0 0.0.0.0 240.0.0.0
> > U 0 0 0 eth0
> >
> > ifconfig eth0:0 yields:
> > >ip a
> >
> > 2: eth0:
> > link/ether
> > inet 192.168.1.2/24 brd 192.168.1.255 scope global eth0
> > inet 117.222.15.189/8 brd 117.255.255.255 scope global eth0:0
> > 3: ppp0:
> > link/ppp
> > inet 117.222.15.189 peer 117.222.8.1/32 scope global ppp0
> >
> > This is a lone host - no network.
> > Address 117.222.15.189 does not map to modem-router. Nmap on modem
> > returns ports 23,80,5431 open. All ports on 117.222.15.189 filtered.
> > The state may not be reproducible. Oftentiimes eth0 gets only
> > 192.168.1.2 address (which can be pinged ),and ppp0 does not exist.
> >
> >
> > On 7/14/14, mett <mett@pmars.jp> wrote:
> > > On Mon, 14 Jul 2014 00:31:43 +0530
> > > rajiv chavan <rc214105@gmail.com> wrote:
> > >
> > >> Sun, 13 Jul 2014 23:34:41 +0530
> > >>
> > >> ip a output on an adsl+ (pppoe) client:
> > >> =snip=
> > >> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
> > >> pfifo_fast state UP group default qlen 1000
> > >> inet 192.168.1.2/24 brd 192.168.1.255 scope global eth0
> > >> 3: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1460 qdisc
> > >> pfifo_fast state UNKNOWN group default qlen 3
> > >> link/ppp
> > >> inet 117.222.15.189 peer 117.222.8.1/32 scope global ppp0
> > >> =snip=
> > >> Can ping 127.0.0.1 and 192.168.1.1 but not 117.222.15.189 nor
> > >> 192.168.1.2 tcpdump on eth0 detcts pppoe packets from
> > >> 117.222.15.189 to hosts except 192.168.1.1-2
> > >> nmap reports 117.222.15.189 ip but all posrt 1-1000 filtered.
> > >>
> > >>
> > >
> > > Hi,
> > >
> > > Everything is on the same interface?
> > > I don't think Eth0 can be routing for your local network and at
> > > the same time become ppp0 and route for a global network.
> > > I think you'll need some kind of subinterfaces if you want to use
> > > only one physical interface for your local network and the outside
> > > one.
> > >
> > > Maybe try a traceroute and you'll see where the packets are going.
> > > Also, check the routes(netstat -nr or route -ne).
> > >
> > > You might give a try one by one to see at what point it stops
> > > working: -try only the local network first and once it's working
> > > try to set up your pppoe link.
> > >
> > > hth
> > >
> > >
> > > --
> > > To UNSUBSCRIBE, email to debian-user-REQUEST@lists.debian.org
> > > with a subject of "unsubscribe". Trouble? Contact
> > > listmaster@lists.debian.org
> > > Archive:
> > > [🔎] 20140714091211.3c1fd4cd@asus.tamerr">https://lists.debian.org/[🔎] 20140714091211.3c1fd4cd@asus.tamerr
> > >
> > >
>
> No prob,
> by the way, better to answer to the list than PM to my address,
> as sby who might have same problem can see this thread and benefit of
> the info as well.
>
> Also, on this mailing list, generally you post down the thread,
> like this other persons reading the thread can get an idea of the
> whole thing, easily by scrolling down.
>
> Regarding the issue, if this is a lone host and you are not NATing,
> one easy way of trblshooting would be :
> -no manual ip address at all on eth0
> -no manual routes as well,
> -then run pppoeconf, it's quite straight forward and tells you if it
> finds an aggregator on your ISP side.
>
> With the following top.
>
> PC----modem-----Internet
>
>
> Did you try to set up route manually, as I can see many routes under
> netstat -nr ?
>
> By the way, I never tried with subinterfaces on same phy for outside
> and inside, but I don't understand why you have a route for
> multicast(224 smtg) and also a route for the 117.0.0.0 network and
> at the same time one for 192.168, all that on eth0.
> Even if eth0 is showing eth0:0, I don't think you need a route for
> 117.0.0.0., neither one for multicast(224).
>
> Try to remove them and see what happened but would be better, faster
> and easier to just run pppoeconf with an eth0 interface without any IP
> address.
>
> Also, I was talking about traceroute from your host to outside.
> If it doesn't go anywhere, you will be sure the problem is on your
> side.
>
> Also, you said your host is alone, no network but eth0 on 192.168.1.2
> can be pinged. I don't understand how that is possible.
>
>
> As a ref, I paste mine down here
> # netstat -nr
> Kernel IP routing table
> Destination Gateway Genmask Flags MSS Window
> irtt Iface
> ISP.AGG.IP.ADD 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
> 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
> 0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 ppp0
>
> Thing is I have 2 phy interfaces, so ppp0 is not running on eth0 but
> eth1, that you cannot see here.
> I only ran pppoeconf, did not install any routes or ip address on the
> ppp0 interface.
>
> then ip a
>
> 2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
> state UP qlen 1000
> link/ether 00:22:cf:6b:68:0d brd ff:ff:ff:ff:ff:ff
>
> 3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
> state UP qlen 1000
> link/ether 00:07:95:d5:2f:da brd ff:ff:ff:ff:ff:ff
> inet 192.168.1.1/24 brd 192.168.1.255 scope global eth0
> 190: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1454 qdisc
> pfifo_fast state UNKNOWN qlen 3
> link/ppp
> inet PUB.LIC.IP.ADD peer ISP.AGG.IP.ADD/32 scope global ppp0
>
> hth
>
> ====
>
> Mon, 14 Jul 2014 13:38:51 +0530
>
> one interface eth0.
> + adsl modem-router
>
> Three possible states:
>
> 1
> (Rare) output normal as in your eth0,ppp0
> ppp0 address can be used to connect to host on all ports.
>
> 2
> Usual,: only eth0 address 192.168.1.2 is visible, modem will be on
> 192.168.1.1 No ppp link: traceroute to some address first hops at
> 192.168.1.1 second hop at ppp-peer (117.x.x.1).
> 192.168.1.1-2 can be pinged. Public IP address maps to
> modem-router(ISP-provided). Can check with nmap
> Host unreachable on ssh, cannot be pinged from other hosts.
> Tcpdump cannot capture any packet tp/from public-ip addr: probably
> ppp0 on router itself (bridged mode)
> Public ip addr visible on modem web interface as WAN IP address ( and
> to interent hosts as ENV{REMOTE_ADDR})
> >route -n
> Destination Gateway Genmask Flags Metric Ref
> Use Iface 0.0.0.0 192.168.1.1 0.0.0.0 UG
> 0 0 0 eth0 127.0.0.0 0.0.0.0
> 255.0.0.0 U 0 0 0 lo 192.168.1.0
> 0.0.0.0 255.255.255.0 U 0 0 0 eth0
> 224.0.0.0 0.0.0.0 240.0.0.0 U 0 0
> 0 eth0
>
>
> 3
> Infrequent: Public ip 117.222.13.120 (ppp0) /192.168.1.2 cannot be
> pinged. 192.168.1.1(modem) can be pinged
> Pulblic ip (ppp0) does not map to modem-router/localhost. Nmap returns
> all ports filtered.
> Traceroute to other hosts -
> first hop at 117.222.8.1.( ppp peer)
> Tcpdump detects pppoe session traffic from/to ppp0 [ether header
> absent - this is not localhost]
>
> >netstat -rn
> 117.0.0.0 routed thro' eth0
> 192.168.1.0 routed thro' ppp0
> - - -
> Second and Third state : cannot connect to host from other hosts[ ssh
> telnet} Only localhost can initiate connection.
> DHCP lease is <24 hours. Can be a few hours or few minutes at times.
> Connectivity loss is random and frequent.
>
> pppoe stats on modem:
> Service VPI/VCI Protocol Interface
> Received Transmitted Bytes Pkts Errs
> Drops Bytes Pkts Errs Drops
> pppoe_0_35_1 0/0/35 PPPoE ppp_0_0_35_1
> 3162509 4204 0 0 312523
> 3994 0 0 br_0_32 0/0/32 Bridge
> nas_0_0_32 0 0 0 0 3992916
> 56909 0 283 br_0_100 0/0/100
> Bridge nas_0_0_100 0 0 0 0
> 3992902 56909 0 282 br_8_81 0/8/81
> Bridge nas_0_8_81 0 0 0 0
> 3993320 56910 0 280 br_8_35 0/8/35
> Bridge nas_0_8_35 0 0 0 0
> 3992951 56909 0 280 br_14_34
> 0/14/34 Bridge nas_0_14_34 0 0
> 0 0 3992951 56909 0 279
> br_1_41 0/1/41 Bridge nas_0_1_41 0
> 0 0 0 3993377 56910 0 277
>
> Modem replacement does not alter the options.
>
> ====
> Apologies for all earlier errors
> ====
>
>
Hey Rajiv,
No prob at all.
You're talking about a modem-router. Are you trying to run your ISP
modem-router in bridge-mode? Or only NAT?
If NAT, then you don't need ppp on your PC's eth0, usually the
router_modem is providing dhcp services on its local interface.
But you will need to do port-forwarding to be able to ssh or anything
from outside.
hth
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