[syslog-ng] RES: RES: Problem to Get UDP Packets - Syslog-ng

Wed Mar 25 18:29:02 UTC 2020

The IP from mgalnxa01 is 10.96.145.42

This its example from tcpdump

/usr/sbin/tcpdump -vn port 9514 -i eth1

tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 262144 bytes
14:11:19.670962 IP (tos 0x20, ttl 251, id 16868, offset 0, flags [none], proto UDP (17), length 244)
    10.96.145.98.syslog > 10.96.145.42.9514: SYSLOG, length: 216
        Facility user (1), Severity info (6)
        Msg: Mar 25 17:11:19 2020 RTCGNMGA0103 RT_NAT: RT_SRC_NAT_PBA_ALLOC: Subscriber 100.64.1.59 used/maximum [2/2] blocks, allocates port block [63616-63679] from 177.51.116.174 in source pool PUBLIC-NAT-POOL-1 lsys_id: 0

14:15:45.153159 IP (tos 0x20, ttl 251, id 16869, offset 0, flags [none], proto UDP (17), length 245)
    10.96.145.98.syslog > 10.96.145.42.9514: SYSLOG, length: 217
        Facility user (1), Severity info (6)
        Msg: Mar 25 17:15:44 2020 RTCGNMGA0103 RT_NAT: RT_SRC_NAT_PBA_RELEASE: Subscriber 100.64.1.59 used/maximum [1/2] blocks, releases port block [63616-63679] from 177.51.116.174 in source pool PUBLIC-NAT-POOL-1 lsys_id: 0

Atenciosamente,

WILLIAM LUIZ R V SILVA
Mediation

Ericsson
Rua Maria Preste Maia, 300
02879-130, Brazil
Phone  +55 11   2760-3785
Mobile +55 11  97979-9886
wsilva_ericsson at timbrasil.com.br
www.ericsson.com

-----Mensagem original-----
De: syslog-ng <syslog-ng-bounces at lists.balabit.hu> Em nome de Matus UHLAR - fantomas
Enviada em: quarta-feira, 25 de março de 2020 15:13
Para: syslog-ng at lists.balabit.hu
Assunto: Re: [syslog-ng] RES: Problem to Get UDP Packets - Syslog-ng

On 25.03.20 17:54, William Luiz Ribeiro Vasconcelos Da Silva wrote:
>I still understand that it is not a firewall, because the machine that
>sends the packets is on the same network as my machine: 10.96.145.98>
>10.96.145.42

iptables on destination linux machine is also a firewall.
firewall does not necessarily mean another machine

>Yes, I am receiving the packets on the network interface where the IP "10.96.145.42" is allocated, in my case eth1.

is it the "mgalnxa01" in your capture example below?

>10:46:13.529331 IP (tos 0x20, ttl 251, id 33055, offset 0, flags [none], proto UDP (17), length 243)
>    10.96.145.98.syslog > mgalnxa01.9514: [udp sum ok] SYSLOG, length:
>215

next time run tcpdump with "-n" option

--
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